Return nil when JRuby has no console device - #157
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Summary
Return
nilfrom JRuby'sIO.consolehelper when neither cached console nor usable tty exists.Reproduction
A focused external model supplies non-tty standard streams. Current code stores
niland then sends the requested method to it; the candidate matches MRI by returningnil.Verification
Compatibility
Restores the documented MRI return contract. JRuby was modeled but is unavailable locally; current upstream CI is green on JRuby. Prepared with AI-assisted source review; no repository tests were changed.