[king-wwwhhh]

Fixes #6334.

MappingIterator now validates content after the closing token of a root-level wrapper array when FAIL_ON_TRAILING_TOKENS is enabled. A second root value is reported through DeserializationContext.reportTrailingTokens(), while malformed trailing input raises the parser error instead of being silently ignored.

The check is limited to root-level arrays. Nested arrays remain usable with caller-owned parsers, and disabling FAIL_ON_TRAILING_TOKENS preserves the previous behavior. Managed parsers are still closed when the trailing-content check fails.

Regression coverage includes:

• managed root-array iteration with a second array;
• malformed content after a managed root array;
• a caller-owned parser with a cleared root START_ARRAY;
• disabled-feature and nested-array controls.

Validation:

• before the implementation, the focused suite had 2 failing regression methods and 8 passing controls;
• FullStreamReadTest, ReadValuesTest, and ReadValuesLeakTest: 30 passed;
• complete jackson-databind module: 7,580 passed, 0 failures, 0 errors, 1 pre-existing skip.

Local JaCoCo collection was disabled because its Windows agent could not create the workspace output file. Tests ran on Eclipse Temurin 17.0.18. Other OS/JDK combinations were not run locally.

AI assistance: Codex helped investigate, implement, and run the test matrix; the resulting behavior and diff were reviewed against the issue scope.

[gitar-bot]

Code Review ✅ Approved

🟡 Medium risk · Checking tokens after root-array iteration when FAIL_ON_TRAILING_TOKENS is enabled could reject inputs containing additional root values or malformed trailing data.

Adds trailing-token validation for root-level wrapper arrays in MappingIterator when FAIL_ON_TRAILING_TOKENS is enabled, reporting a second root value via DeserializationContext.reportTrailingTokens() and surfacing malformed trailing input as a parser error. No issues found.

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