Rails
Ruby 2.5.0
6.1
6.0
5.2
5.1
5.0
4.2
2.6.0
2.7.0
3.0
constant Zlib::BEST_COMPRESSION
BEST_COMPRESSION -> Integer
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Zlib::Deflate.new
や
Zlib::Deflate#deflate
等に渡す、圧縮レベルを表す整数です。