Merge branch 'master' into feat/enumerable-to_a-block #233

Job	Run time
check_format	1m 48s
deploy_api_docs	0s
x86_64-gnu-test-preview_mt	5m 40s
x86_64-gnu-test (1.7.3)	33m 37s
x86_64-musl-test	37m 7s
x86_64-gnu-test (1.8.2)	32m 34s
x86_64-gnu-test (1.9.2)	32m 40s
x86_64-gnu-test (1.10.1)	32m 48s
x86_64-gnu-test (1.0.0, FLAGS=-Dwithout_ffi USE_PCRE1=true)	30m 45s
x86_64-gnu-test (1.1.1, FLAGS=-Dwithout_ffi USE_PCRE1=true)	33m 40s
x86_64-gnu-test (1.2.2, USE_PCRE1=true)	32m 41s
x86_64-gnu-test (1.3.2, USE_PCRE1=true)	33m 26s
x86_64-gnu-test (1.4.1, USE_PCRE1=true)	34m 12s
x86_64-gnu-test (1.5.1, USE_PCRE1=true)	32m 28s
x86_64-gnu-test (1.6.2, USE_PCRE1=true)	31m 45s
	6h 45m 11s

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