diff --git a/.bca-baseline.toml b/.bca-baseline.toml
index c3637bca..ac054009 100644
--- a/.bca-baseline.toml
+++ b/.bca-baseline.toml
@@ -728,14 +728,14 @@ value = 16.0
 [[entry]]
 path = "src/metrics/cognitive.rs"
 qualified = "tcl_switch_decision_arms"
-start_line = 447
+start_line = 448
 metric = "nargs"
 value = 7.0
 
 [[entry]]
 path = "src/metrics/cognitive.rs"
 qualified = "tcl_switch_decision_arms"
-start_line = 447
+start_line = 448
 metric = "nexits"
 value = 6.0
 
@@ -968,7 +968,7 @@ path = "src/tools.rs"
 qualified = "<file>"
 start_line = 1
 metric = "loc.sloc"
-value = 761.0
+value = 767.0
 
 [[entry]]
 path = "src/tools.rs"
diff --git a/Cargo.lock b/Cargo.lock
index a2f1eadb..027665b3 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -364,7 +364,7 @@ checksum = "72b3254f16251a8381aa12e40e3c4d2f0199f8c6508fbecb9d91f575e0fbb8c6"
 
 [[package]]
 name = "bca-tree-sitter-ccomment"
-version = "2.0.0"
+version = "2.0.1"
 dependencies = [
  "cc",
  "tree-sitter-language",
@@ -372,7 +372,7 @@ dependencies = [
 
 [[package]]
 name = "bca-tree-sitter-mozcpp"
-version = "2.0.0"
+version = "2.0.1"
 dependencies = [
  "cc",
  "tree-sitter-cpp",
@@ -381,7 +381,7 @@ dependencies = [
 
 [[package]]
 name = "bca-tree-sitter-mozjs"
-version = "2.0.0"
+version = "2.0.1"
 dependencies = [
  "cc",
  "tree-sitter-javascript",
@@ -390,7 +390,7 @@ dependencies = [
 
 [[package]]
 name = "bca-tree-sitter-preproc"
-version = "2.0.0"
+version = "2.0.1"
 dependencies = [
  "cc",
  "tree-sitter-language",
@@ -398,7 +398,7 @@ dependencies = [
 
 [[package]]
 name = "bca-tree-sitter-tcl"
-version = "2.0.0"
+version = "2.0.1"
 dependencies = [
  "cc",
  "tree-sitter-language",
@@ -406,7 +406,7 @@ dependencies = [
 
 [[package]]
 name = "big-code-analysis"
-version = "2.0.0"
+version = "2.0.1"
 dependencies = [
  "aho-corasick",
  "bca-tree-sitter-ccomment",
@@ -462,7 +462,7 @@ dependencies = [
 
 [[package]]
 name = "big-code-analysis-cli"
-version = "2.0.0"
+version = "2.0.1"
 dependencies = [
  "assert_cmd",
  "big-code-analysis",
@@ -484,7 +484,7 @@ dependencies = [
 
 [[package]]
 name = "big-code-analysis-py"
-version = "2.0.0"
+version = "2.0.1"
 dependencies = [
  "big-code-analysis",
  "globset",
@@ -498,7 +498,7 @@ dependencies = [
 
 [[package]]
 name = "big-code-analysis-web"
-version = "2.0.0"
+version = "2.0.1"
 dependencies = [
  "actix-rt",
  "actix-web",
@@ -5082,7 +5082,7 @@ checksum = "1ffae5123b2d3fc086436f8834ae3ab053a283cfac8fe0a0b8eaae044768a4c4"
 
 [[package]]
 name = "xtask"
-version = "2.0.0"
+version = "2.0.1"
 dependencies = [
  "big-code-analysis-cli",
  "big-code-analysis-web",
diff --git a/Cargo.toml b/Cargo.toml
index cdcd4dc7..0aef9378 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -25,7 +25,7 @@ exclude = [
 ]
 
 [workspace.package]
-version = "2.0.0"
+version = "2.0.1"
 edition = "2024"
 rust-version = "1.94"
 license = "MPL-2.0"
@@ -76,11 +76,11 @@ tree-sitter-c = "=0.24.2"
 # Rationale and the rejected alternatives live on the umbrella
 # issue (dekobon/big-code-analysis#149); the operational details
 # (publish order, first-bootstrap workflow) live in `RELEASING.md`.
-tree-sitter-ccomment = { package = "bca-tree-sitter-ccomment", path = "./tree-sitter-ccomment", version = "=2.0.0" }
-tree-sitter-mozcpp = { package = "bca-tree-sitter-mozcpp", path = "./tree-sitter-mozcpp", version = "=2.0.0" }
-tree-sitter-mozjs = { package = "bca-tree-sitter-mozjs", path = "./tree-sitter-mozjs", version = "=2.0.0" }
-tree-sitter-preproc = { package = "bca-tree-sitter-preproc", path = "./tree-sitter-preproc", version = "=2.0.0" }
-tree-sitter-tcl = { package = "bca-tree-sitter-tcl", path = "./tree-sitter-tcl", version = "=2.0.0" }
+tree-sitter-ccomment = { package = "bca-tree-sitter-ccomment", path = "./tree-sitter-ccomment", version = "=2.0.1" }
+tree-sitter-mozcpp = { package = "bca-tree-sitter-mozcpp", path = "./tree-sitter-mozcpp", version = "=2.0.1" }
+tree-sitter-mozjs = { package = "bca-tree-sitter-mozjs", path = "./tree-sitter-mozjs", version = "=2.0.1" }
+tree-sitter-preproc = { package = "bca-tree-sitter-preproc", path = "./tree-sitter-preproc", version = "=2.0.1" }
+tree-sitter-tcl = { package = "bca-tree-sitter-tcl", path = "./tree-sitter-tcl", version = "=2.0.1" }
 
 # PyO3 powers the `big-code-analysis-py` cdylib. Pinned to a major
 # series; bumping is a deliberate, separate change because the Bound
diff --git a/README.md b/README.md
index 7d366a8c..6975c1b9 100644
--- a/README.md
+++ b/README.md
@@ -91,7 +91,7 @@ Every tree-sitter grammar is gated behind a per-language Cargo
 feature. The default feature set is `all-languages`, so a bare
 
 ```toml
-big-code-analysis = "2.0.0"
+big-code-analysis = "2.0.1"
 ```
 
 pulls every grammar in (matching the library's historical behaviour
@@ -100,7 +100,7 @@ only need a subset of languages can opt out of the defaults and
 re-enable just the grammars they want:
 
 ```toml
-big-code-analysis = { version = "2.0.0", default-features = false, features = ["rust", "typescript"] }
+big-code-analysis = { version = "2.0.1", default-features = false, features = ["rust", "typescript"] }
 ```
 
 Supported language features: `bash`, `c`, `cpp`, `csharp`, `elixir`,
diff --git a/STABILITY.md b/STABILITY.md
index ee7ba8c9..6f3daf0f 100644
--- a/STABILITY.md
+++ b/STABILITY.md
@@ -1,6 +1,6 @@
 # Stability policy
 
-`big-code-analysis` is on the `2.x` line (currently `2.0.0`). The
+`big-code-analysis` is on the `2.x` line (currently `2.0.1`). The
 crate graduated from the rapid-iteration `0.x` window into a written
 stability contract and has now made its first major (`2.0`) break:
 callers can pin a minor version and expect a working tree against any
@@ -31,7 +31,7 @@ pin bump (any `tree-sitter-*` crate in the root `Cargo.toml`) or a
 regression fix in a metric definition is by definition a value
 change but does not break the API surface. Callers who need
 bit-for-bit reproducibility should pin to an exact version
-(`big-code-analysis = "= 2.0.0"`) and store that version alongside
+(`big-code-analysis = "= 2.0.1"`) and store that version alongside
 their results — see [What is stable in value](#what-is-stable-in-value)
 below.
 
@@ -399,7 +399,7 @@ versions, even within `2.x`.** Concretely:
 This is the one deliberate carve-out in the `2.x` contract. The
 *shape* of the data is stable; the *numbers in the cells* are not.
 If you need to compare metric runs across time, pin to an exact
-version (`big-code-analysis = "= 2.0.0"`) and store the version
+version (`big-code-analysis = "= 2.0.1"`) and store the version
 alongside the results.
 
 ### Float precision and non-finite values
diff --git a/big-code-analysis-book/src/library/cargo-features.md b/big-code-analysis-book/src/library/cargo-features.md
index bdec10b4..19c4f084 100644
--- a/big-code-analysis-book/src/library/cargo-features.md
+++ b/big-code-analysis-book/src/library/cargo-features.md
@@ -6,7 +6,7 @@ the default
 
 ```toml
 [dependencies]
-big-code-analysis = "2.0.0"
+big-code-analysis = "2.0.1"
 ```
 
 pulls every grammar in — matching the library's historical
@@ -24,7 +24,7 @@ A downstream service that only analyses Rust and TypeScript:
 
 ```toml
 [dependencies]
-big-code-analysis = { version = "2.0.0", default-features = false, features = ["rust", "typescript"] }
+big-code-analysis = { version = "2.0.1", default-features = false, features = ["rust", "typescript"] }
 ```
 
 The library still compiles, the `LANG` enum still has every
diff --git a/big-code-analysis-book/src/library/quick-start.md b/big-code-analysis-book/src/library/quick-start.md
index c21da70f..5ca00d05 100644
--- a/big-code-analysis-book/src/library/quick-start.md
+++ b/big-code-analysis-book/src/library/quick-start.md
@@ -8,7 +8,7 @@ metrics from a string of source code.
 ```toml
 # Cargo.toml
 [dependencies]
-big-code-analysis = "2.0.0"
+big-code-analysis = "2.0.1"
 ```
 
 The crate uses Rust edition 2024 and pins `rust-version = "1.94"`.
diff --git a/big-code-analysis-book/src/library/stability.md b/big-code-analysis-book/src/library/stability.md
index b52890a4..6ff48961 100644
--- a/big-code-analysis-book/src/library/stability.md
+++ b/big-code-analysis-book/src/library/stability.md
@@ -1,6 +1,6 @@
 # Stability and versioning
 
-`big-code-analysis` is on the `2.x` line (currently `2.0.0`). The
+`big-code-analysis` is on the `2.x` line (currently `2.0.1`). The
 full stability contract lives in [`STABILITY.md`][stability] at the
 root of the repository — that file is the source of truth and is
 updated alongside the changelog at every release.
@@ -22,7 +22,7 @@ The headlines for library consumers:
   bump or a bug fix in a metric definition can shift any metric
   value on any file in any direction, even across a patch bump.
   Each such drift is flagged in the changelog. Pin to an exact
-  version (`big-code-analysis = "= 2.0.0"`) if you need bit-for-bit
+  version (`big-code-analysis = "= 2.0.1"`) if you need bit-for-bit
   reproducibility across runs.
 - **MSRV is `1.94`.** Bumping the MSRV is treated as a minor-bump
   event and is flagged in the changelog under **(breaking)** —
diff --git a/big-code-analysis-book/src/recipes/ci.md b/big-code-analysis-book/src/recipes/ci.md
index a5b66057..5b994d84 100644
--- a/big-code-analysis-book/src/recipes/ci.md
+++ b/big-code-analysis-book/src/recipes/ci.md
@@ -103,7 +103,7 @@ so a green-path rerun skips the download entirely:
 
 ```yaml
 env:
-  BCA_VERSION: "2.0.0"
+  BCA_VERSION: "2.0.1"
   BCA_TARGET:  "x86_64-unknown-linux-gnu"
   # sha256 of big-code-analysis-${BCA_VERSION}-${BCA_TARGET}.tar.gz from the
   # release's SHA256SUMS file. Bump together with BCA_VERSION.
@@ -176,7 +176,7 @@ default for downstream adopters.
 - name: Install bca
   uses: taiki-e/install-action@v2
   with:
-    tool: big-code-analysis-cli@2.0.0
+    tool: big-code-analysis-cli@2.0.1
 ```
 
 ```yaml
@@ -184,7 +184,7 @@ default for downstream adopters.
 - name: Install cargo-binstall
   uses: cargo-bins/cargo-binstall@main
 - name: Install bca
-  run: cargo binstall --no-confirm big-code-analysis-cli --version 2.0.0
+  run: cargo binstall --no-confirm big-code-analysis-cli --version 2.0.1
 ```
 
 If either action falls back to compilation, cache the cargo registry +
@@ -233,7 +233,7 @@ jobs:
       - name: Install bca
         uses: taiki-e/install-action@v2
         with:
-          tool: big-code-analysis-cli@2.0.0
+          tool: big-code-analysis-cli@2.0.1
       - name: Generate report
         run: |
           bca \
@@ -662,7 +662,7 @@ stages:
   - quality
 
 variables:
-  BCA_VERSION: "2.0.0"  # pin a published big-code-analysis-cli release
+  BCA_VERSION: "2.0.1"  # pin a published big-code-analysis-cli release
   BCA_TARGET:  "x86_64-unknown-linux-gnu"
   # sha256 of big-code-analysis-${BCA_VERSION}-${BCA_TARGET}.tar.gz from
   # the release's SHA256SUMS file. Bump together with BCA_VERSION.
diff --git a/big-code-analysis-cli/Cargo.toml b/big-code-analysis-cli/Cargo.toml
index a0be3648..79fc8e1e 100644
--- a/big-code-analysis-cli/Cargo.toml
+++ b/big-code-analysis-cli/Cargo.toml
@@ -20,7 +20,7 @@ ignore = "^0.4"
 # The CLI exposes every language `bca` advertises, so it pins the
 # library's full feature set explicitly. Disabling default features
 # here would silently drop grammars from the CLI build. See #252.
-big-code-analysis = { path = "..", version = "=2.0.0", default-features = false, features = [
+big-code-analysis = { path = "..", version = "=2.0.1", default-features = false, features = [
   "all-languages",
   # End-user binary ships every backend that exists; `vcs` is the
   # umbrella turning on `vcs-git` (issue #328).
diff --git a/big-code-analysis-web/Cargo.toml b/big-code-analysis-web/Cargo.toml
index 65c718f7..7ab0d472 100644
--- a/big-code-analysis-web/Cargo.toml
+++ b/big-code-analysis-web/Cargo.toml
@@ -18,7 +18,7 @@ futures = "^0.3"
 # pins the library's full feature set explicitly. Disabling default
 # features here would silently drop grammars from the daemon build.
 # See #252.
-big-code-analysis = { path = "..", version = "=2.0.0", default-features = false, features = [
+big-code-analysis = { path = "..", version = "=2.0.1", default-features = false, features = [
   "all-languages",
   # `POST /vcs` change-history endpoint (issue #328).
   "vcs",
diff --git a/codecov.yml b/codecov.yml
index b2acc7b1..e13c365b 100644
--- a/codecov.yml
+++ b/codecov.yml
@@ -27,6 +27,17 @@ comment:
 # always runs) and `python` (pytest-cov, only on PRs that touch the
 # bindings). carryforward keeps the python number from vanishing on
 # Rust-only PRs, where the python-test job is skipped.
+#
+# Measurement gap (intentional): the `python` flag measures only the pure-
+# Python surface via pytest-cov. The PyO3 *Rust* layer in
+# big-code-analysis-py/src/ (lib.rs, vcs.rs, node.rs, ast.rs, sarif.rs) is
+# exercised by those same pytest suites, but the crate has no `#[test]`s, so
+# `cargo llvm-cov nextest` (which only runs cargo tests) never instruments
+# it. Its standalone Rust-line coverage therefore reads far lower than it is
+# actually tested — do not "fix" that number by adding redundant cargo tests
+# that re-cover behaviour pytest already drives. Closing it for real means
+# instrumenting the maturin/pytest run and merging that profdata, tracked
+# separately.
 flag_management:
   default_rules:
     carryforward: true
diff --git a/enums/Cargo.lock b/enums/Cargo.lock
index 8be1b84e..1477db74 100644
--- a/enums/Cargo.lock
+++ b/enums/Cargo.lock
@@ -125,7 +125,7 @@ dependencies = [
 
 [[package]]
 name = "bca-tree-sitter-ccomment"
-version = "2.0.0"
+version = "2.0.1"
 dependencies = [
  "cc",
  "tree-sitter-language",
@@ -133,7 +133,7 @@ dependencies = [
 
 [[package]]
 name = "bca-tree-sitter-mozcpp"
-version = "2.0.0"
+version = "2.0.1"
 dependencies = [
  "cc",
  "tree-sitter-cpp",
@@ -142,7 +142,7 @@ dependencies = [
 
 [[package]]
 name = "bca-tree-sitter-mozjs"
-version = "2.0.0"
+version = "2.0.1"
 dependencies = [
  "cc",
  "tree-sitter-javascript",
@@ -151,7 +151,7 @@ dependencies = [
 
 [[package]]
 name = "bca-tree-sitter-preproc"
-version = "2.0.0"
+version = "2.0.1"
 dependencies = [
  "cc",
  "tree-sitter-language",
@@ -159,7 +159,7 @@ dependencies = [
 
 [[package]]
 name = "bca-tree-sitter-tcl"
-version = "2.0.0"
+version = "2.0.1"
 dependencies = [
  "cc",
  "tree-sitter-language",
@@ -233,7 +233,7 @@ dependencies = [
 
 [[package]]
 name = "enums"
-version = "2.0.0"
+version = "2.0.1"
 dependencies = [
  "askama",
  "bca-tree-sitter-ccomment",
diff --git a/enums/Cargo.toml b/enums/Cargo.toml
index 1e7a3f9d..dfabfe18 100644
--- a/enums/Cargo.toml
+++ b/enums/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "enums"
-version = "2.0.0"
+version = "2.0.1"
 publish = false
 authors = ["Calixte Denizet <cdenizet@mozilla.com>"]
 edition = "2024"
@@ -37,11 +37,11 @@ tree-sitter-c = "=0.24.2"
 # Vendored grammar forks — see ../Cargo.toml for rationale on the
 # `package = ...` alias trick that preserves the `tree_sitter_<lang>`
 # import path while the published crate name is `bca-tree-sitter-<lang>`.
-tree-sitter-tcl = { package = "bca-tree-sitter-tcl", path = "../tree-sitter-tcl", version = "=2.0.0" }
-tree-sitter-preproc = { package = "bca-tree-sitter-preproc", path = "../tree-sitter-preproc", version = "=2.0.0" }
-tree-sitter-ccomment = { package = "bca-tree-sitter-ccomment", path = "../tree-sitter-ccomment", version = "=2.0.0" }
-tree-sitter-mozcpp = { package = "bca-tree-sitter-mozcpp", path = "../tree-sitter-mozcpp", version = "=2.0.0" }
-tree-sitter-mozjs = { package = "bca-tree-sitter-mozjs", path = "../tree-sitter-mozjs", version = "=2.0.0" }
+tree-sitter-tcl = { package = "bca-tree-sitter-tcl", path = "../tree-sitter-tcl", version = "=2.0.1" }
+tree-sitter-preproc = { package = "bca-tree-sitter-preproc", path = "../tree-sitter-preproc", version = "=2.0.1" }
+tree-sitter-ccomment = { package = "bca-tree-sitter-ccomment", path = "../tree-sitter-ccomment", version = "=2.0.1" }
+tree-sitter-mozcpp = { package = "bca-tree-sitter-mozcpp", path = "../tree-sitter-mozcpp", version = "=2.0.1" }
+tree-sitter-mozjs = { package = "bca-tree-sitter-mozjs", path = "../tree-sitter-mozjs", version = "=2.0.1" }
 
 [profile.release]
 debug = "line-tables-only"
diff --git a/man/bca-check.1 b/man/bca-check.1
index b4386311..05605749 100644
--- a/man/bca-check.1
+++ b/man/bca-check.1
@@ -1,6 +1,6 @@
 .ie \n(.g .ds Aq \(aq
 .el .ds Aq '
-.TH BCA-CHECK 1  "big-code-analysis 2.0.0" "big-code-analysis Manual"
+.TH BCA-CHECK 1  "big-code-analysis 2.0.1" "big-code-analysis Manual"
 .SH NAME
 bca\-check \- Check per\-function metrics against thresholds. Exits 2 when any threshold is exceeded; reserve exit 1 for tool errors so CI can distinguish "metric regression" from "tool crashed". `\-\-strict\-exit\-codes` opts into tiered codes (2\-5) that split the violation case by severity
 .SH SYNOPSIS
diff --git a/man/bca-count.1 b/man/bca-count.1
index e75837d6..928ee249 100644
--- a/man/bca-count.1
+++ b/man/bca-count.1
@@ -1,6 +1,6 @@
 .ie \n(.g .ds Aq \(aq
 .el .ds Aq '
-.TH BCA-COUNT 1  "big-code-analysis 2.0.0" "big-code-analysis Manual"
+.TH BCA-COUNT 1  "big-code-analysis 2.0.1" "big-code-analysis Manual"
 .SH NAME
 bca\-count \- Count nodes of one or more types
 .SH SYNOPSIS
diff --git a/man/bca-diff-baseline.1 b/man/bca-diff-baseline.1
index 705ac140..8f253364 100644
--- a/man/bca-diff-baseline.1
+++ b/man/bca-diff-baseline.1
@@ -1,6 +1,6 @@
 .ie \n(.g .ds Aq \(aq
 .el .ds Aq '
-.TH BCA-DIFF-BASELINE 1  "big-code-analysis 2.0.0" "big-code-analysis Manual"
+.TH BCA-DIFF-BASELINE 1  "big-code-analysis 2.0.1" "big-code-analysis Manual"
 .SH NAME
 bca\-diff\-baseline \- Diff two `.bca\-baseline.toml` files and report what was added, removed, worsened, or improved. Replaces the in\-the\-head TOML diff parsing the book\*(Aqs PR\-review recipe used to walk through. Exits 0 on success by default — the diff is informational, not a gate. With `\-\-exit\-code`, exits 2 when the filtered diff is non\-empty
 .SH SYNOPSIS
diff --git a/man/bca-diff.1 b/man/bca-diff.1
index 359b1bf9..d40f0789 100644
--- a/man/bca-diff.1
+++ b/man/bca-diff.1
@@ -1,6 +1,6 @@
 .ie \n(.g .ds Aq \(aq
 .el .ds Aq '
-.TH BCA-DIFF 1  "big-code-analysis 2.0.0" "big-code-analysis Manual"
+.TH BCA-DIFF 1  "big-code-analysis 2.0.1" "big-code-analysis Manual"
 .SH NAME
 bca\-diff \- Compare two metric\-output runs and report, per metric, which files changed (old to new), plus files added/removed between the two sets. Each side is a per\-file JSON file or a directory tree of them (the form `bca metrics \-O json \-\-output\-dir DIR` writes). Replaces the grammar\-bump glue chain — the external `json\-minimal\-tests` binary plus `split\-minimal\-tests.py` — with one native command. Exits 0 on success by default; the diff is informational, not a gate. With `\-\-exit\-code`, exits 2 when the filtered diff is non\-empty
 .SH SYNOPSIS
diff --git a/man/bca-dump.1 b/man/bca-dump.1
index 504b02f5..abb346de 100644
--- a/man/bca-dump.1
+++ b/man/bca-dump.1
@@ -1,6 +1,6 @@
 .ie \n(.g .ds Aq \(aq
 .el .ds Aq '
-.TH BCA-DUMP 1  "big-code-analysis 2.0.0" "big-code-analysis Manual"
+.TH BCA-DUMP 1  "big-code-analysis 2.0.1" "big-code-analysis Manual"
 .SH NAME
 bca\-dump \- Dump the AST to stdout. Each file\*(Aqs tree is prefixed with a `== <path> ==` banner so a multi\-file dump is attributable. Requires an explicit path — unlike the other walking subcommands, bare `bca dump` errors instead of dumping the whole current directory (a whole\-tree AST dump has no plausible use)
 .SH SYNOPSIS
diff --git a/man/bca-exemptions.1 b/man/bca-exemptions.1
index 0cce204e..407d1772 100644
--- a/man/bca-exemptions.1
+++ b/man/bca-exemptions.1
@@ -1,6 +1,6 @@
 .ie \n(.g .ds Aq \(aq
 .el .ds Aq '
-.TH BCA-EXEMPTIONS 1  "big-code-analysis 2.0.0" "big-code-analysis Manual"
+.TH BCA-EXEMPTIONS 1  "big-code-analysis 2.0.1" "big-code-analysis Manual"
 .SH NAME
 bca\-exemptions \- Audit everything the `bca check` gate skips in one view: in\-source suppression markers (`bca: suppress`, `#lizard forgives`, …), `[check.exclude]` globs, and `.bca\-baseline.toml` entries. Read\-only; always exits 0 on success
 .SH SYNOPSIS
diff --git a/man/bca-find.1 b/man/bca-find.1
index 78ad907d..c51294b3 100644
--- a/man/bca-find.1
+++ b/man/bca-find.1
@@ -1,6 +1,6 @@
 .ie \n(.g .ds Aq \(aq
 .el .ds Aq '
-.TH BCA-FIND 1  "big-code-analysis 2.0.0" "big-code-analysis Manual"
+.TH BCA-FIND 1  "big-code-analysis 2.0.1" "big-code-analysis Manual"
 .SH NAME
 bca\-find \- Find nodes of one or more types
 .SH SYNOPSIS
diff --git a/man/bca-functions.1 b/man/bca-functions.1
index 1e954511..bee39c15 100644
--- a/man/bca-functions.1
+++ b/man/bca-functions.1
@@ -1,6 +1,6 @@
 .ie \n(.g .ds Aq \(aq
 .el .ds Aq '
-.TH BCA-FUNCTIONS 1  "big-code-analysis 2.0.0" "big-code-analysis Manual"
+.TH BCA-FUNCTIONS 1  "big-code-analysis 2.0.1" "big-code-analysis Manual"
 .SH NAME
 bca\-functions \- List functions/methods and their spans
 .SH SYNOPSIS
diff --git a/man/bca-init.1 b/man/bca-init.1
index fedecc38..8e123aa6 100644
--- a/man/bca-init.1
+++ b/man/bca-init.1
@@ -1,6 +1,6 @@
 .ie \n(.g .ds Aq \(aq
 .el .ds Aq '
-.TH BCA-INIT 1  "big-code-analysis 2.0.0" "big-code-analysis Manual"
+.TH BCA-INIT 1  "big-code-analysis 2.0.1" "big-code-analysis Manual"
 .SH NAME
 bca\-init \- Scaffold the canonical adoption files (`bca.toml` manifest, `.bcaignore`, `.bca\-baseline.toml`) in the current directory. Replaces the six\-step copy\-paste flow from the book\*(Aqs adoption recipe. Refuses to overwrite existing files without `\-\-force`
 .SH SYNOPSIS
diff --git a/man/bca-list-metrics.1 b/man/bca-list-metrics.1
index fa766c25..00a6a360 100644
--- a/man/bca-list-metrics.1
+++ b/man/bca-list-metrics.1
@@ -1,6 +1,6 @@
 .ie \n(.g .ds Aq \(aq
 .el .ds Aq '
-.TH BCA-LIST-METRICS 1  "big-code-analysis 2.0.0" "big-code-analysis Manual"
+.TH BCA-LIST-METRICS 1  "big-code-analysis 2.0.1" "big-code-analysis Manual"
 .SH NAME
 bca\-list\-metrics \- List the metrics this tool can compute and exit
 .SH SYNOPSIS
diff --git a/man/bca-metrics.1 b/man/bca-metrics.1
index 7daf1c6d..0eb992d0 100644
--- a/man/bca-metrics.1
+++ b/man/bca-metrics.1
@@ -1,6 +1,6 @@
 .ie \n(.g .ds Aq \(aq
 .el .ds Aq '
-.TH BCA-METRICS 1  "big-code-analysis 2.0.0" "big-code-analysis Manual"
+.TH BCA-METRICS 1  "big-code-analysis 2.0.1" "big-code-analysis Manual"
 .SH NAME
 bca\-metrics \- Compute per\-file metrics and emit them in a structured format
 .SH SYNOPSIS
diff --git a/man/bca-ops.1 b/man/bca-ops.1
index 2442e126..f373a170 100644
--- a/man/bca-ops.1
+++ b/man/bca-ops.1
@@ -1,6 +1,6 @@
 .ie \n(.g .ds Aq \(aq
 .el .ds Aq '
-.TH BCA-OPS 1  "big-code-analysis 2.0.0" "big-code-analysis Manual"
+.TH BCA-OPS 1  "big-code-analysis 2.0.1" "big-code-analysis Manual"
 .SH NAME
 bca\-ops \- Extract per\-file operands and operators
 .SH SYNOPSIS
diff --git a/man/bca-preproc.1 b/man/bca-preproc.1
index dea5edcc..fa860464 100644
--- a/man/bca-preproc.1
+++ b/man/bca-preproc.1
@@ -1,6 +1,6 @@
 .ie \n(.g .ds Aq \(aq
 .el .ds Aq '
-.TH BCA-PREPROC 1  "big-code-analysis 2.0.0" "big-code-analysis Manual"
+.TH BCA-PREPROC 1  "big-code-analysis 2.0.1" "big-code-analysis Manual"
 .SH NAME
 bca\-preproc \- Generate preprocessor\-data JSON for C/C++ analysis
 .SH SYNOPSIS
diff --git a/man/bca-report.1 b/man/bca-report.1
index 0fd5b0fc..038c42b7 100644
--- a/man/bca-report.1
+++ b/man/bca-report.1
@@ -1,6 +1,6 @@
 .ie \n(.g .ds Aq \(aq
 .el .ds Aq '
-.TH BCA-REPORT 1  "big-code-analysis 2.0.0" "big-code-analysis Manual"
+.TH BCA-REPORT 1  "big-code-analysis 2.0.1" "big-code-analysis Manual"
 .SH NAME
 bca\-report \- Generate an aggregated report across the analyzed source
 .SH SYNOPSIS
diff --git a/man/bca-strip-comments.1 b/man/bca-strip-comments.1
index 6e3e33f4..94474aef 100644
--- a/man/bca-strip-comments.1
+++ b/man/bca-strip-comments.1
@@ -1,6 +1,6 @@
 .ie \n(.g .ds Aq \(aq
 .el .ds Aq '
-.TH BCA-STRIP-COMMENTS 1  "big-code-analysis 2.0.0" "big-code-analysis Manual"
+.TH BCA-STRIP-COMMENTS 1  "big-code-analysis 2.0.1" "big-code-analysis Manual"
 .SH NAME
 bca\-strip\-comments \- Remove comments from source files
 .SH SYNOPSIS
diff --git a/man/bca-vcs-commit.1 b/man/bca-vcs-commit.1
index 283e88f0..b76869a0 100644
--- a/man/bca-vcs-commit.1
+++ b/man/bca-vcs-commit.1
@@ -1,6 +1,6 @@
 .ie \n(.g .ds Aq \(aq
 .el .ds Aq '
-.TH BCA-VCS-COMMIT 1  "big-code-analysis 2.0.0" "big-code-analysis Manual"
+.TH BCA-VCS-COMMIT 1  "big-code-analysis 2.0.1" "big-code-analysis Manual"
 .SH NAME
 bca\-vcs\-commit \- Score a single commit for defect\-induction risk — the just\-in\-time (JIT) defect\-prediction unit a CI gate reviews at check\-in. Emits a JSON breakdown of size / diffusion / history / experience / purpose features, their contributions, and an ordinal composite score. Window / `\-\-ref` / bot / merge / rename behaviour comes from the parent `vcs` flags. The old `jit` spelling stays a hidden alias for one release cycle
 .SH SYNOPSIS
diff --git a/man/bca-vcs-trend.1 b/man/bca-vcs-trend.1
index e5516c97..17701c2b 100644
--- a/man/bca-vcs-trend.1
+++ b/man/bca-vcs-trend.1
@@ -1,6 +1,6 @@
 .ie \n(.g .ds Aq \(aq
 .el .ds Aq '
-.TH BCA-VCS-TREND 1  "big-code-analysis 2.0.0" "big-code-analysis Manual"
+.TH BCA-VCS-TREND 1  "big-code-analysis 2.0.1" "big-code-analysis Manual"
 .SH NAME
 bca\-vcs\-trend \- Sample the change\-history metrics at several points in time and emit a per\-file time series, surfacing whether code is improving or degrading over the project\*(Aqs life. Each point re\-anchors at the mainline tip of that moment, so it is a faithful historical snapshot. Window / `\-\-ref` / bot / merge / rename / as\-of (the most\-recent anchor) and `\-\-top` (files kept) come from the parent `vcs` flags
 .SH SYNOPSIS
diff --git a/man/bca-vcs.1 b/man/bca-vcs.1
index 4d527f31..14807e49 100644
--- a/man/bca-vcs.1
+++ b/man/bca-vcs.1
@@ -1,6 +1,6 @@
 .ie \n(.g .ds Aq \(aq
 .el .ds Aq '
-.TH BCA-VCS 1  "big-code-analysis 2.0.0" "big-code-analysis Manual"
+.TH BCA-VCS 1  "big-code-analysis 2.0.1" "big-code-analysis Manual"
 .SH NAME
 bca\-vcs \- Rank files by change\-history (VCS) risk: churn, commit and author counts, ownership dilution, and bug\- / security\-fix history over a git working tree. Errors clearly outside a repo
 .SH SYNOPSIS
diff --git a/man/bca-web.1 b/man/bca-web.1
index 3ce15cbf..68288cb3 100644
--- a/man/bca-web.1
+++ b/man/bca-web.1
@@ -1,6 +1,6 @@
 .ie \n(.g .ds Aq \(aq
 .el .ds Aq '
-.TH BCA-WEB 1  "big-code-analysis 2.0.0" "big-code-analysis Manual"
+.TH BCA-WEB 1  "big-code-analysis 2.0.1" "big-code-analysis Manual"
 .SH NAME
 bca\-web \- Run a web server.
 .SH SYNOPSIS
@@ -34,6 +34,6 @@ Print help (see a summary with \*(Aq\-h\*(Aq)
 \fB\-V\fR, \fB\-\-version\fR
 Print version
 .SH VERSION
-v2.0.0
+v2.0.1
 .SH AUTHORS
 Calixte Denizet <cdenizet@mozilla.com>, Elijah Zupancic <elijah@zupancic.name>
diff --git a/man/bca.1 b/man/bca.1
index 8415fd16..a23823f2 100644
--- a/man/bca.1
+++ b/man/bca.1
@@ -1,6 +1,6 @@
 .ie \n(.g .ds Aq \(aq
 .el .ds Aq '
-.TH BCA 1  "big-code-analysis 2.0.0" "big-code-analysis Manual"
+.TH BCA 1  "big-code-analysis 2.0.1" "big-code-analysis Manual"
 .SH NAME
 bca \- Analyze source code.
 .SH SYNOPSIS
@@ -88,6 +88,6 @@ Every other subcommand exits 0 on success and 1 on error.
 Migrating from the flag\-style CLI? See the migration guide:
   https://dekobon.github.io/big\-code\-analysis/migration.html
 .SH VERSION
-v2.0.0
+v2.0.1
 .SH AUTHORS
 Calixte Denizet <cdenizet@mozilla.com>, Elijah Zupancic <elijah@zupancic.name>
diff --git a/src/error.rs b/src/error.rs
index c7b435b1..8ba34306 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -178,3 +178,78 @@ impl From<MetricsError> for FromPathError {
         Self::Parse(e)
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::error::Error as _;
+    use std::io::{Error as IoError, ErrorKind};
+
+    // `FromPathError`'s `Display` / `source` impls and its `From`
+    // conversion are part of the stable error surface but are only
+    // reached on `from_path` failure paths that no other test drives.
+    // Pin the message shape (substring, not exact wording) and the
+    // `source` chaining contract, which is what `?`-propagating callers
+    // and `anyhow`-style reporters rely on.
+
+    #[test]
+    fn from_path_error_display_covers_every_variant() {
+        let io = FromPathError::Io(IoError::new(ErrorKind::PermissionDenied, "denied"));
+        assert!(io.to_string().contains("could not read file"));
+        assert!(io.to_string().contains("denied"));
+
+        assert!(
+            FromPathError::NonUtf8Path
+                .to_string()
+                .contains("not valid UTF-8")
+        );
+        assert!(
+            FromPathError::Unreadable
+                .to_string()
+                .contains("empty, binary")
+        );
+        assert!(
+            FromPathError::UnknownLanguage
+                .to_string()
+                .contains("no language is registered")
+        );
+
+        // `Parse` delegates to the wrapped `MetricsError`'s `Display`.
+        let parse = FromPathError::Parse(MetricsError::LanguageDisabled(LANG::Rust));
+        assert_eq!(
+            parse.to_string(),
+            MetricsError::LanguageDisabled(LANG::Rust).to_string()
+        );
+    }
+
+    #[test]
+    fn from_path_error_source_chains_only_for_wrapping_variants() {
+        // `Io` and `Parse` wrap an underlying error and must expose it;
+        // the leaf variants must report no source.
+        let io = FromPathError::Io(IoError::new(ErrorKind::NotFound, "missing"));
+        assert!(io.source().is_some(), "Io must chain to the io::Error");
+
+        let parse = FromPathError::Parse(MetricsError::EmptyRoot);
+        assert!(parse.source().is_some(), "Parse must chain to MetricsError");
+
+        for leaf in [
+            FromPathError::NonUtf8Path,
+            FromPathError::Unreadable,
+            FromPathError::UnknownLanguage,
+        ] {
+            assert!(leaf.source().is_none(), "{leaf:?} must report no source");
+        }
+    }
+
+    #[test]
+    fn metrics_error_converts_into_parse_variant() {
+        let converted: FromPathError = MetricsError::LanguageDisabled(LANG::Cpp).into();
+        assert!(
+            matches!(
+                converted,
+                FromPathError::Parse(MetricsError::LanguageDisabled(LANG::Cpp))
+            ),
+            "From<MetricsError> must wrap into Parse"
+        );
+    }
+}
diff --git a/src/langs.rs b/src/langs.rs
index c4ca44a0..17c4d382 100644
--- a/src/langs.rs
+++ b/src/langs.rs
@@ -76,7 +76,7 @@ mk_langs!(
         tree_sitter_mozjs,
         [jsm],
         [],
-        "2.0.0"
+        "2.0.1"
     ),
     (
         "java",
@@ -148,7 +148,7 @@ mk_langs!(
         tree_sitter_tcl,
         [tcl, tk, tm],
         ["tcl"],
-        "2.0.0"
+        "2.0.1"
     ),
     (
         "irules",
@@ -210,7 +210,7 @@ mk_langs!(
         tree_sitter_mozcpp,
         [],
         [],
-        "2.0.0"
+        "2.0.1"
     ),
     (
         "objc",
@@ -311,7 +311,7 @@ mk_langs!(
         tree_sitter_ccomment,
         [],
         [],
-        "2.0.0"
+        "2.0.1"
     ),
     (
         "c-family-helpers",
@@ -323,7 +323,7 @@ mk_langs!(
         tree_sitter_preproc,
         [],
         [],
-        "2.0.0"
+        "2.0.1"
     ),
     (
         "perl",
diff --git a/src/language_enum_roundtrip.rs b/src/language_enum_roundtrip.rs
new file mode 100644
index 00000000..8e305103
--- /dev/null
+++ b/src/language_enum_roundtrip.rs
@@ -0,0 +1,78 @@
+//! Drift guard for the generated per-language token enums.
+//!
+//! This module lives at the crate root rather than under `src/languages/`
+//! because that directory is wholly owned by the `enums/` codegen — the
+//! `enums-codegen-drift` gate flags any hand-written file there as stale.
+//!
+//! Each `language_<lang>.rs` exposes two generated conversion tables —
+//! `From<u16>` (node-kind id → enum variant) and `From<Enum> for
+//! &'static str` (variant → kind name). They are pure lookup tables, so
+//! nothing exercises most of their arms unless a fixture happens to
+//! contain a node of that exact kind; on a typical run they sit at a few
+//! percent line coverage and a silent disagreement with the live grammar
+//! (e.g. after a grammar bump renumbers node kinds) goes unnoticed.
+//!
+//! For every supported language we walk all `0..node_kind_count` ids the
+//! grammar defines, round-trip each through both tables, and assert the
+//! enum's name string agrees with the grammar for every *visible* kind.
+//! This both pins the mapping against drift (the same fear behind the
+//! `grammar_version` guard in `src/langs.rs`) and drives the generated
+//! tables to near-full coverage.
+
+use crate::langs::LANG;
+use crate::languages::*;
+
+/// Round-trips every node-kind id the grammar behind `lang` defines
+/// through the generated `From<u16>` and `From<Enum> for &'static str`
+/// tables, asserting the enum name matches the grammar for each visible
+/// kind. Languages whose grammar feature is disabled in the current
+/// build are skipped (the enum surface is always compiled, but
+/// `tree_sitter_language` hands back `Err(LanguageDisabled)`).
+fn check<E>(lang: LANG)
+where
+    E: From<u16> + Into<&'static str>,
+{
+    let Ok(grammar) = lang.tree_sitter_language() else {
+        return;
+    };
+    let count = grammar.node_kind_count();
+    for id in 0..count {
+        // Node-kind ids are u16 in tree-sitter; `node_kind_count` can
+        // never exceed that range, so the cast is lossless.
+        let id = u16::try_from(id).expect("node-kind id exceeds u16");
+        let variant: E = id.into();
+        let name: &'static str = variant.into();
+        // Hidden / supertype kinds carry grammar-internal names that the
+        // enum deliberately does not mirror; only assert on the visible
+        // surface, but still convert above so every arm is exercised.
+        if grammar.node_kind_is_visible(id) {
+            assert_eq!(
+                Some(name),
+                grammar.node_kind_for_id(id),
+                "{lang:?} kind id {id}: enum name {name:?} disagrees with grammar"
+            );
+        }
+    }
+}
+
+macro_rules! roundtrip_tests {
+    ($($lang:ident),* $(,)?) => {
+        $(
+            // The token enum and the `LANG` variant share a name; the
+            // type position resolves to the re-exported token enum, the
+            // value position to `LANG::$lang`.
+            #[test]
+            #[allow(non_snake_case)]
+            fn $lang() {
+                check::<$lang>(LANG::$lang);
+            }
+        )*
+    };
+}
+
+// One arm per `mk_langs!` entry in `src/langs.rs`. Keep in sync: a new
+// language must gain a round-trip test here too.
+roundtrip_tests!(
+    Javascript, Mozjs, Java, Go, Kotlin, Lua, Rust, Tcl, Irules, C, Cpp, Mozcpp, Objc, Csharp,
+    Elixir, Python, Tsx, Typescript, Bash, Ccomment, Preproc, Perl, Php, Ruby, Groovy,
+);
diff --git a/src/lib.rs b/src/lib.rs
index 3d1bd404..ce3f9b0c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -122,6 +122,8 @@ mod c_macro;
 mod cfg_predicate;
 mod checker;
 mod getter;
+#[cfg(test)]
+mod language_enum_roundtrip;
 mod languages;
 mod macros;
 
diff --git a/src/metrics/npa.rs b/src/metrics/npa.rs
index b5338bb0..8aca34a1 100644
--- a/src/metrics/npa.rs
+++ b/src/metrics/npa.rs
@@ -550,7 +550,7 @@ implement_metric_trait!(
     clippy::too_many_lines
 )]
 mod tests {
-    use crate::tools::{assert_child_space_kind, check_func_space, check_metrics};
+    use crate::tools::{assert_child_space_kind, check_func_space, check_metrics, child_space};
 
     use super::*;
 
@@ -4011,4 +4011,46 @@ mod tests {
         check_metrics::<JavaParser>("interface Foo {}", "foo.java", assert_zero);
         check_metrics::<CsharpParser>("interface Foo {}", "foo.cs", assert_zero);
     }
+
+    // Rounds out `npa`'s public surface — the `Display` impl and the
+    // per-space `class_npa` / `class_na` / `interface_*` accessors —
+    // mirroring the `Display` tests the sibling metrics carry.
+    #[test]
+    fn stats_display_and_per_space_accessors() {
+        check_func_space::<JavaParser, _>(
+            "public interface I {\n    int K = 1;\n}\n\
+             public class C {\n    public int a;\n    private int b;\n}\n",
+            "X.java",
+            |unit| {
+                // Class C: a public, b private → 1 public of 2 attributes.
+                // Interface I: one constant K.
+                assert_eq!(unit.metrics.npa.class_npa_sum(), 1);
+                assert_eq!(unit.metrics.npa.class_na_sum(), 2);
+                let rendered = unit.metrics.npa.to_string();
+                for fragment in [
+                    "classes: 1, interfaces: 1",
+                    "class_attributes: 2",
+                    "interface_attributes: 1",
+                    "total: 2, total_attributes: 3",
+                ] {
+                    assert!(
+                        rendered.contains(fragment),
+                        "missing {fragment:?} in {rendered}"
+                    );
+                }
+                // Singular accessors populate only on the owning class /
+                // interface space (0 on the file-unit root); assert them where
+                // they are nonzero so an always-zero or wrong-field accessor
+                // would fail.
+                let class = child_space(&unit, "C");
+                assert_eq!(class.kind, SpaceKind::Class);
+                assert_eq!(class.metrics.npa.class_npa(), 1);
+                assert_eq!(class.metrics.npa.class_na(), 2);
+                let iface = child_space(&unit, "I");
+                assert_eq!(iface.kind, SpaceKind::Interface);
+                assert_eq!(iface.metrics.npa.interface_npa(), 1);
+                assert_eq!(iface.metrics.npa.interface_na(), 1);
+            },
+        );
+    }
 }
diff --git a/src/metrics/npm.rs b/src/metrics/npm.rs
index 35307e97..85116854 100644
--- a/src/metrics/npm.rs
+++ b/src/metrics/npm.rs
@@ -478,7 +478,7 @@ implement_metric_trait!(
     clippy::too_many_lines
 )]
 mod tests {
-    use crate::tools::{assert_child_space_kind, check_func_space, check_metrics};
+    use crate::tools::{assert_child_space_kind, check_func_space, check_metrics, child_space};
 
     use super::*;
 
@@ -3446,4 +3446,46 @@ class C {
         check_metrics::<JavaParser>("interface Foo {}", "foo.java", assert_zero);
         check_metrics::<CsharpParser>("interface Foo {}", "foo.cs", assert_zero);
     }
+
+    // Rounds out `npm`'s public surface — the `Display` impl and the
+    // per-space `class_npm` / `class_nm` / `interface_*` accessors —
+    // mirroring the `Display` tests the sibling metrics carry.
+    #[test]
+    fn stats_display_and_per_space_accessors() {
+        check_func_space::<JavaParser, _>(
+            "public interface I {\n    void p();\n}\n\
+             public class C {\n    public void m() {}\n    private void n() {}\n}\n",
+            "X.java",
+            |unit| {
+                // Class C: m public, n private → 1 public of 2 methods.
+                // Interface I: one method p.
+                assert_eq!(unit.metrics.npm.class_npm_sum(), 1);
+                assert_eq!(unit.metrics.npm.class_nm_sum(), 2);
+                let rendered = unit.metrics.npm.to_string();
+                for fragment in [
+                    "classes: 1, interfaces: 1",
+                    "class_methods: 2",
+                    "interface_methods: 1",
+                    "total: 2, total_methods: 3",
+                ] {
+                    assert!(
+                        rendered.contains(fragment),
+                        "missing {fragment:?} in {rendered}"
+                    );
+                }
+                // Singular accessors populate only on the owning class /
+                // interface space (0 on the file-unit root); assert them where
+                // they are nonzero so an always-zero or wrong-field accessor
+                // would fail.
+                let class = child_space(&unit, "C");
+                assert_eq!(class.kind, SpaceKind::Class);
+                assert_eq!(class.metrics.npm.class_npm(), 1);
+                assert_eq!(class.metrics.npm.class_nm(), 2);
+                let iface = child_space(&unit, "I");
+                assert_eq!(iface.kind, SpaceKind::Interface);
+                assert_eq!(iface.metrics.npm.interface_npm(), 1);
+                assert_eq!(iface.metrics.npm.interface_nm(), 1);
+            },
+        );
+    }
 }
diff --git a/src/metrics/wmc.rs b/src/metrics/wmc.rs
index 86ae8dbd..d98ac995 100644
--- a/src/metrics/wmc.rs
+++ b/src/metrics/wmc.rs
@@ -440,7 +440,7 @@ implement_metric_trait!(
     clippy::too_many_lines
 )]
 mod tests {
-    use crate::tools::{assert_child_space_kind, check_func_space, check_metrics};
+    use crate::tools::{assert_child_space_kind, check_func_space, check_metrics, child_space};
 
     use super::*;
 
@@ -3736,4 +3736,35 @@ mod tests {
             },
         );
     }
+
+    // Rounds out `wmc`'s public surface — the `Display` impl and the
+    // per-space `class_wmc` / `interface_wmc` accessors — mirroring the
+    // `Display` tests the sibling metrics (nom, nargs, halstead) carry.
+    #[test]
+    fn stats_display_and_per_space_accessors() {
+        check_func_space::<JavaParser, _>(
+            "public interface I {\n    void p();\n}\n\
+             public class C {\n    public void m() {}\n    private void n() {}\n}\n",
+            "X.java",
+            |unit| {
+                // Root rollup: class C contributes WMC 2, interface I contributes 1.
+                assert_eq!(unit.metrics.wmc.class_wmc_sum(), 2);
+                assert_eq!(unit.metrics.wmc.interface_wmc_sum(), 1);
+                assert_eq!(
+                    unit.metrics.wmc.to_string(),
+                    "classes: 2, interfaces: 1, total: 3"
+                );
+                // The singular accessors are per-space and populate only on the
+                // owning class / interface space (0 on the file-unit root), so
+                // assert them where they are nonzero — an accessor that always
+                // returned 0 or read the wrong field would fail here.
+                let class = child_space(&unit, "C");
+                assert_eq!(class.kind, SpaceKind::Class);
+                assert_eq!(class.metrics.wmc.class_wmc(), 2);
+                let iface = child_space(&unit, "I");
+                assert_eq!(iface.kind, SpaceKind::Interface);
+                assert_eq!(iface.metrics.wmc.interface_wmc(), 1);
+            },
+        );
+    }
 }
diff --git a/src/output/snapshots/big_code_analysis__output__sarif__tests__sarif_empty.snap b/src/output/snapshots/big_code_analysis__output__sarif__tests__sarif_empty.snap
index 4218bcf7..c33040b5 100644
--- a/src/output/snapshots/big_code_analysis__output__sarif__tests__sarif_empty.snap
+++ b/src/output/snapshots/big_code_analysis__output__sarif__tests__sarif_empty.snap
@@ -10,7 +10,7 @@ expression: "render(&[])"
       "tool": {
         "driver": {
           "name": "big-code-analysis",
-          "version": "2.0.0",
+          "version": "2.0.1",
           "rules": []
         }
       },
diff --git a/src/output/snapshots/big_code_analysis__output__sarif__tests__sarif_multi.snap b/src/output/snapshots/big_code_analysis__output__sarif__tests__sarif_multi.snap
index cad46fb0..06344347 100644
--- a/src/output/snapshots/big_code_analysis__output__sarif__tests__sarif_multi.snap
+++ b/src/output/snapshots/big_code_analysis__output__sarif__tests__sarif_multi.snap
@@ -10,7 +10,7 @@ expression: render(&offenders)
       "tool": {
         "driver": {
           "name": "big-code-analysis",
-          "version": "2.0.0",
+          "version": "2.0.1",
           "rules": [
             {
               "id": "cognitive",
diff --git a/src/tools.rs b/src/tools.rs
index 4dc3a7ea..008e6bff 100644
--- a/src/tools.rs
+++ b/src/tools.rs
@@ -800,6 +800,22 @@ pub(crate) fn assert_child_space_kind(
     );
 }
 
+/// Returns the direct child [`FuncSpace`][crate::FuncSpace] named `name`,
+/// panicking if absent. Lets per-space-metric tests assert accessors on the
+/// owning class / interface space (where the value is nonzero) rather than on
+/// the always-zero file-unit root.
+#[cfg(test)]
+pub(crate) fn child_space<'a>(
+    func_space: &'a crate::FuncSpace,
+    name: &str,
+) -> &'a crate::FuncSpace {
+    func_space
+        .spaces
+        .iter()
+        .find(|s| s.name.as_deref() == Some(name))
+        .unwrap_or_else(|| panic!("expected a child FuncSpace named {name:?}"))
+}
+
 #[cfg(test)]
 #[path = "tools_tests.rs"]
 mod tests;
diff --git a/tests/alterator_string_flattening.rs b/tests/alterator_string_flattening.rs
new file mode 100644
index 00000000..2939c5ef
--- /dev/null
+++ b/tests/alterator_string_flattening.rs
@@ -0,0 +1,82 @@
+//! Behavioural coverage for the per-language `Alterator::alterate`
+//! string-flattening arms in `src/alterator.rs`.
+//!
+//! `alterate` collapses a string-like literal into a single leaf
+//! [`AstNode`] holding its verbatim source text, so the AST dump (and the
+//! REST `/ast` endpoint that consumes it) renders `"hi"` as one node
+//! rather than exposing the grammar's delimiter / `string_content`
+//! children. Eight languages — Objective-C, Mozilla C++, C#, Lua, Tcl,
+//! iRules, Ruby, and Elixir — had no dump test reaching this arm, leaving
+//! their `alterate` impls entirely uncovered. Each case parses a minimal
+//! snippet, dumps it through the public [`Ast::dump`] API, and asserts the
+//! literal survives as a verbatim leaf.
+//!
+//! The assertion is non-vacuous: without flattening the literal's quotes
+//! and body land in separate child leaves (`"`, `hi`, `"`), so no single
+//! leaf carries the full quoted text — only the `alterate` arm produces a
+//! childless node whose value is `"hi"`.
+#![allow(missing_docs)]
+
+use big_code_analysis::{Ast, AstCfg, AstNode, LANG, Source};
+
+/// Dumps `code` for `lang` and returns the root AST node. Runs only under
+/// builds where `lang`'s grammar feature is enabled (the `--all-features`
+/// test leg); the `feature-matrix` legs merely `cargo check` this file.
+fn dump_root(lang: LANG, code: &str, file_name: &str) -> AstNode {
+    let cfg = AstCfg {
+        id: String::new(),
+        language: String::new(),
+        comment: false,
+        span: false,
+    };
+    Ast::parse(Source::new(lang, code.as_bytes()).with_name(Some(file_name.to_owned())))
+        .expect("language feature enabled under --all-features")
+        .dump(cfg)
+        .root
+        .expect("source parses to a root AST node")
+}
+
+/// True if the tree contains a leaf node (no children) whose verbatim
+/// value equals `literal` — the signature of a flattened string arm.
+fn has_verbatim_leaf(node: &AstNode, literal: &str) -> bool {
+    (node.children.is_empty() && node.value == literal)
+        || node.children.iter().any(|c| has_verbatim_leaf(c, literal))
+}
+
+#[track_caller]
+fn assert_flattened(lang: LANG, code: &str, file_name: &str, literal: &str) {
+    let root = dump_root(lang, code, file_name);
+    assert!(
+        has_verbatim_leaf(&root, literal),
+        "{lang:?}: expected {literal:?} to survive as a single verbatim leaf in the AST dump"
+    );
+}
+
+/// Emits one `#[test]` per `name: lang, code, file, literal;` case, each
+/// asserting the literal survives `alterate` as a single verbatim leaf.
+/// Mirrors the `roundtrip_tests!` pattern in `src/language_enum_roundtrip.rs`.
+macro_rules! flatten_cases {
+    ($($name:ident: $lang:expr, $code:expr, $file:expr, $lit:expr;)*) => {
+        $(
+            #[test]
+            fn $name() {
+                assert_flattened($lang, $code, $file, $lit);
+            }
+        )*
+    };
+}
+
+flatten_cases! {
+    objc_flattens_string_literal: LANG::Objc, "int f(void) { const char *s = \"hi\"; return 0; }", "f.m", "\"hi\"";
+    mozcpp_flattens_string_literal: LANG::Mozcpp, "int f() { const char *s = \"hi\"; return 0; }", "f.cpp", "\"hi\"";
+    csharp_flattens_string_literal: LANG::Csharp, "class C { void M() { string s = \"hi\"; } }", "f.cs", "\"hi\"";
+    lua_flattens_string_literal: LANG::Lua, "local s = \"hi\"", "f.lua", "\"hi\"";
+    tcl_flattens_quoted_word: LANG::Tcl, "set s \"hi\"", "f.tcl", "\"hi\"";
+    // In valid iRules a quoted word only appears inside an event handler's
+    // `{ … }` body, which `alterate` flattens as a single `braced_word` leaf
+    // (the same match arm that handles `quoted_word`), so the verbatim text
+    // to look for is the whole brace block.
+    irules_flattens_braced_word: LANG::Irules, "when HTTP_REQUEST { set s \"hi\" }", "f.irul", "{ set s \"hi\" }";
+    ruby_flattens_string_literal: LANG::Ruby, "s = \"hi\"\n", "f.rb", "\"hi\"";
+    elixir_flattens_string_literal: LANG::Elixir, "s = \"hi\"\n", "f.ex", "\"hi\"";
+}
diff --git a/tests/snapshots/sarif_test__sarif_multi_offender.snap b/tests/snapshots/sarif_test__sarif_multi_offender.snap
index db2d8301..a01319b5 100644
--- a/tests/snapshots/sarif_test__sarif_multi_offender.snap
+++ b/tests/snapshots/sarif_test__sarif_multi_offender.snap
@@ -10,7 +10,7 @@ expression: out
       "tool": {
         "driver": {
           "name": "big-code-analysis",
-          "version": "2.0.0",
+          "version": "2.0.1",
           "rules": [
             {
               "id": "cyclomatic",
diff --git a/tests/snapshots/sarif_test__sarif_zero_offenders.snap b/tests/snapshots/sarif_test__sarif_zero_offenders.snap
index 2bfb8148..35ef5b22 100644
--- a/tests/snapshots/sarif_test__sarif_zero_offenders.snap
+++ b/tests/snapshots/sarif_test__sarif_zero_offenders.snap
@@ -10,7 +10,7 @@ expression: out
       "tool": {
         "driver": {
           "name": "big-code-analysis",
-          "version": "2.0.0",
+          "version": "2.0.1",
           "rules": []
         }
       },
diff --git a/tree-sitter-ccomment/Cargo.lock b/tree-sitter-ccomment/Cargo.lock
index e3b5ff66..542883d9 100644
--- a/tree-sitter-ccomment/Cargo.lock
+++ b/tree-sitter-ccomment/Cargo.lock
@@ -13,7 +13,7 @@ dependencies = [
 
 [[package]]
 name = "bca-tree-sitter-ccomment"
-version = "2.0.0"
+version = "2.0.1"
 dependencies = [
  "cc",
  "tree-sitter",
diff --git a/tree-sitter-ccomment/Cargo.toml b/tree-sitter-ccomment/Cargo.toml
index 88aaf313..cc36024f 100644
--- a/tree-sitter-ccomment/Cargo.toml
+++ b/tree-sitter-ccomment/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "bca-tree-sitter-ccomment"
 description = "Ccomment grammar for the tree-sitter parsing library (big-code-analysis fork)"
-version = "2.0.0"
+version = "2.0.1"
 authors = [
   "Calixte Denizet <cdenizet@mozilla.com>",
   "Elijah Zupancic <elijah@zupancic.name>",
diff --git a/tree-sitter-mozcpp/Cargo.lock b/tree-sitter-mozcpp/Cargo.lock
index c07948bc..d1bcca84 100644
--- a/tree-sitter-mozcpp/Cargo.lock
+++ b/tree-sitter-mozcpp/Cargo.lock
@@ -13,7 +13,7 @@ dependencies = [
 
 [[package]]
 name = "bca-tree-sitter-mozcpp"
-version = "2.0.0"
+version = "2.0.1"
 dependencies = [
  "cc",
  "tree-sitter",
diff --git a/tree-sitter-mozcpp/Cargo.toml b/tree-sitter-mozcpp/Cargo.toml
index e965dc29..42ef620c 100644
--- a/tree-sitter-mozcpp/Cargo.toml
+++ b/tree-sitter-mozcpp/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "bca-tree-sitter-mozcpp"
 description = "Mozcpp grammar for the tree-sitter parsing library (big-code-analysis fork)"
-version = "2.0.0"
+version = "2.0.1"
 authors = [
   "Calixte Denizet <cdenizet@mozilla.com>",
   "Elijah Zupancic <elijah@zupancic.name>",
diff --git a/tree-sitter-mozjs/Cargo.lock b/tree-sitter-mozjs/Cargo.lock
index f2f1c3e6..34b94d13 100644
--- a/tree-sitter-mozjs/Cargo.lock
+++ b/tree-sitter-mozjs/Cargo.lock
@@ -13,7 +13,7 @@ dependencies = [
 
 [[package]]
 name = "bca-tree-sitter-mozjs"
-version = "2.0.0"
+version = "2.0.1"
 dependencies = [
  "cc",
  "tree-sitter",
diff --git a/tree-sitter-mozjs/Cargo.toml b/tree-sitter-mozjs/Cargo.toml
index ce3bf537..567b2d5b 100644
--- a/tree-sitter-mozjs/Cargo.toml
+++ b/tree-sitter-mozjs/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "bca-tree-sitter-mozjs"
 description = "Mozjs grammar for the tree-sitter parsing library (big-code-analysis fork)"
-version = "2.0.0"
+version = "2.0.1"
 authors = [
   "Calixte Denizet <cdenizet@mozilla.com>",
   "Elijah Zupancic <elijah@zupancic.name>",
diff --git a/tree-sitter-preproc/Cargo.lock b/tree-sitter-preproc/Cargo.lock
index d7618b5e..68bcc529 100644
--- a/tree-sitter-preproc/Cargo.lock
+++ b/tree-sitter-preproc/Cargo.lock
@@ -13,7 +13,7 @@ dependencies = [
 
 [[package]]
 name = "bca-tree-sitter-preproc"
-version = "2.0.0"
+version = "2.0.1"
 dependencies = [
  "cc",
  "tree-sitter",
diff --git a/tree-sitter-preproc/Cargo.toml b/tree-sitter-preproc/Cargo.toml
index eb58e3c1..dff3c2d6 100644
--- a/tree-sitter-preproc/Cargo.toml
+++ b/tree-sitter-preproc/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "bca-tree-sitter-preproc"
 description = "Preproc grammar for the tree-sitter parsing library (big-code-analysis fork)"
-version = "2.0.0"
+version = "2.0.1"
 authors = [
   "Calixte Denizet <cdenizet@mozilla.com>",
   "Elijah Zupancic <elijah@zupancic.name>",
diff --git a/tree-sitter-tcl/Cargo.lock b/tree-sitter-tcl/Cargo.lock
index 2f4c9489..c805041a 100644
--- a/tree-sitter-tcl/Cargo.lock
+++ b/tree-sitter-tcl/Cargo.lock
@@ -13,7 +13,7 @@ dependencies = [
 
 [[package]]
 name = "bca-tree-sitter-tcl"
-version = "2.0.0"
+version = "2.0.1"
 dependencies = [
  "cc",
  "tree-sitter",
diff --git a/tree-sitter-tcl/Cargo.toml b/tree-sitter-tcl/Cargo.toml
index c148af10..6717dac8 100644
--- a/tree-sitter-tcl/Cargo.toml
+++ b/tree-sitter-tcl/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "bca-tree-sitter-tcl"
 description = "Tcl grammar for the tree-sitter parsing library (big-code-analysis fork)"
-version = "2.0.0"
+version = "2.0.1"
 authors = [
   "Lewis Russell",
   "Elijah Zupancic <elijah@zupancic.name>",