Isolate mutable state in copied environments - #3114
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OskarEichler wants to merge 2 commits into
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Summary: duplicate class/module entry declaration arrays and the module-name normalization cache when copying an environment, preventing mutations in one copy from leaking into another.
Verification: focused baseline/fixed reproduction, combined RBS 4.2.0 consumer models, and RuboCop (738 files, zero offenses). No tests are added in this PR.
Compatibility: no public API removal or dependency/version change.