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End of Life Ruby 3.0 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

Zlib::GzipFile#sync=

sync = flag

Same as IO. If flag is true, the associated IO object must respond to the flush method. While sync mode is true, the compression ratio decreases sharply.

See also #sync #to_io #os_code also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.1