[6.1] URL.appendingPathExtension("") appends a trailing dot #1091
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Explanation: Prevents a trailing dot from being appended for an empty path extension.
Scope: Only impacts
URL.appendingPathExtension(_:)
when the input is an empty string.Original PR: #1082
Risk: Low - empty string check, restores previous behavior
Testing: Added unit test, swift-ci
Reviewer: @jmschonfeld
Resolves #1080 for
release/6.1