Pluggable compression for cache values. #113

Job	Run time
rubocop	12s
test (2.7, Gemfile, sqlite3:///tmp/test.sqlite3)	1m 21s
test (2.7, Gemfile, mysql2://root:pass@127.0.0.1/test)	1m 20s
test (2.7, Gemfile, postgres://root:pass@127.0.0.1/test)	1m 18s
test (2.7, Gemfile.rails6, sqlite3:///tmp/test.sqlite3)	1m 8s
test (2.7, Gemfile.rails6, mysql2://root:pass@127.0.0.1/test)	1m 5s
test (2.7, Gemfile.rails6, postgres://root:pass@127.0.0.1/test)	1m 6s
test (3.0, Gemfile, sqlite3:///tmp/test.sqlite3)	1m 2s
test (3.0, Gemfile, mysql2://root:pass@127.0.0.1/test)	50s
test (3.0, Gemfile, postgres://root:pass@127.0.0.1/test)	50s
test (3.0, Gemfile.rails6, sqlite3:///tmp/test.sqlite3)	57s
test (3.0, Gemfile.rails6, mysql2://root:pass@127.0.0.1/test)	1m 2s
test (3.0, Gemfile.rails6, postgres://root:pass@127.0.0.1/test)	53s
test (3.1, Gemfile, sqlite3:///tmp/test.sqlite3)	46s
test (3.1, Gemfile, mysql2://root:pass@127.0.0.1/test)	48s
test (3.1, Gemfile, postgres://root:pass@127.0.0.1/test)	55s
test (3.1, Gemfile.rails6, sqlite3:///tmp/test.sqlite3)	58s
test (3.1, Gemfile.rails6, mysql2://root:pass@127.0.0.1/test)	51s
test (3.1, Gemfile.rails6, postgres://root:pass@127.0.0.1/test)	47s
test (3.2, Gemfile, sqlite3:///tmp/test.sqlite3)	1m 32s
test (3.2, Gemfile, mysql2://root:pass@127.0.0.1/test)	57s
test (3.2, Gemfile, postgres://root:pass@127.0.0.1/test)	49s
test (3.2, Gemfile.rails6, sqlite3:///tmp/test.sqlite3)	1m 36s
test (3.2, Gemfile.rails6, mysql2://root:pass@127.0.0.1/test)	54s
test (3.2, Gemfile.rails6, postgres://root:pass@127.0.0.1/test)	49s
	24m 46s

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