Fix parsing arrays with a name that's a prefix of an existing array

src/TomlKeystore.php

@@ -234,15 +234,15 @@ protected function addArrayTableNode(ArrayTableNode $arrayTableNode): void
                 continue;
             }
 
-            if (str_starts_with($header, $arrayTableHeader)) {
+            if (str_starts_with($header, $arrayTableHeader . '.')) {
                 $key = $arrayTable.substr($header, strlen($arrayTableHeader));
 
                 break;
             }
         }
 
         if ($index === 0 && ! $this->tables->filter(
-            static fn ($table) => str_starts_with((string) $table, $header))->isEmpty()
+            static fn ($table) => str_starts_with((string) $table, $header  . "."))->isEmpty()
         ) {
             throw new TomlError('key duplication');
         }

tests/Unit/TomlDecodeTest.php

@@ -63,6 +63,11 @@ function () {
         { "name": "plantain" }
       ]
     }
+  ],
+  "fruit": [
+    {
+      "name": "strawberry"
+    }
   ]
 }
 JSON_STRING;
@@ -111,12 +116,49 @@ function () {
 
 [[fruits.varieties]]
 name = "plantain"
+
+[[fruit]] # prefix of existing array
+name = "strawberry"
 TOML_STRING;
 
         expect(toml_decode($toml))->toEqual(json_decode($json, false))
             ->and(toml_decode($toml, true))->toEqual(json_decode($json, true));
     });
 
+it('can decode array tables whose names share a prefix',
+    /**
+     * @throws TomlError
+     */
+    function () {
+        $toml = <<<'TOML_STRING'
+[[items]]
+name = "first"
+
+[[itemsExtended]]
+name = "second"
+
+[[itemsExtendedMore]]
+name = "third"
+
+[[itemsExtendedMore.entries]]
+name = "first entry"
+
+[itemsExtendedMore.entries.metadata]
+type = "primary"
+
+[[itemsExtendedMore.entries]]
+name = "second entry"
+
+[itemsExtendedMore.entries.metadata]
+type = "secondary"
+TOML_STRING;
+
+        $decoded = toml_decode($toml, true);
+
+        expect($decoded)->toHaveCount(3)
+            ->and($decoded['itemsExtendedMore'][0]['entries'][1]['metadata']['type'])->toBe('secondary');
+    });
+
 it('can decode TOML datetime formats',
     /**
      * @throws TomlError

tests/Unit/TomlErrorTest.php

@@ -35,3 +35,31 @@ function () {
 
         expect(static fn () => toml_decode($toml, true))->toThrow(TomlError::class, $message);
     });
+
+it('throws on invalid array order',
+    /**
+     * @throws TomlError
+     */
+    function () {
+
+        $message = <<<'MESSAGE'
+Invalid TOML document: key duplication
+
+5:  # This requires a to be an array table
+6:  [[a]]
+         ^
+7:  y = 2
+MESSAGE;
+
+        $toml = <<<'TOML_STRING'
+# This creates a as a normal (non-array) table
+[[a.b]]
+x = 1
+
+# This requires a to be an array table
+[[a]]
+y = 2
+TOML_STRING;
+
+        expect(static fn () => toml_decode($toml, true))->toThrow(TomlError::class, $message);
+    });