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Maintenance Ruby 3.3 gets fixes, but no new features. Switch to Ruby 4.0 →

instance method

StringIO#truncate

strio.truncate(integer) → 0

Truncates the buffer string to at most integer bytes. The stream must be opened for writing.

See also #tell #tty? #sync= #ungetbyte also in 4.1 · 4.0 · 3.4 · 3.2 · 3.1 · 3.0