[Vl4dC]

Issue number: closes #8682

Summary

Changes

• Check whether the key exists before updating LRUDict recency. This preserves get defaults for missing keys and updates recency for cached falsey values.
• Add regression tests for both cases.
• Correct the cache docstring to describe least-recently-used eviction.

User experience

LRUDict.get("missing", "fallback") now returns "fallback" instead of raising KeyError. Reading a cached False, 0, None, or empty string now protects that entry from being evicted as the least recently used item. Existing callers using truthy cached values retain their behavior.

Verification

• uv run --locked --no-default-groups --with pytest --with ruff --python 3.12 pytest tests/unit/test_lru_cache.py -q — 11 passed, 1 pre-existing skip.
• Ruff lint and format checks passed for both changed files.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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