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Maintenance Ruby 3.4 gets fixes, but no new features. Switch to Ruby 4.0 →

instance method

StringIO#fileno

() -> nil
fileno

Returns nil. Just for compatibility to IO.

See also #fcntl #flush #external_encoding #fsync also in 4.1 · 4.0 · 3.3 · 3.2 · 3.1 · 3.0