Correct ttyname documentation - #154
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Summary
Correct the reversed
IO#ttynamedocumentation: it returns the terminal name when the IO is a tty andnilotherwise.Reproduction
The implementation first returns
nilwhenisatty(fd)is false, which is the opposite of the current sentence.Verification
Compatibility
Documentation-only; no runtime or public API change. Prepared with AI-assisted source review; no repository tests were changed.