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Clear the header name index with the headers - #1697
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Summary
Clear the header name index together with the Hash.
Reproduction and verification
After Headers.new('X-Demo'=>'one').clear, key?('x-demo') remains true before the fix, and reinsertion inherits removed spelling. Fixed clear returns self, removes membership and lets the next insertion establish its spelling. Related #376 covered replace only.
Limitations
No test/spec files were added or changed because the originating repository explicitly forbids this. Reproductions ran outside the repository. This differs from Faraday's requested regression-test contribution convention and is disclosed for maintainer review. Other Ruby versions/platforms were not run locally. This PR includes only the focused source change; the other fixes and the consumer's separately verified merged JSON decoder patch #1687 are not added here.
Breaking-change notes
No new API; removed header spellings no longer survive clear.