Add and update specs for IO methods #2491

Job	Run time
RuboCop	52s
specs (macos, 3.4.9)	1m 16s
specs (ubuntu, 4.0.4, --parser=parse.y)	1m 34s
specs (ubuntu, 4.0.4, --enable-frozen-string-literal)	1m 28s
specs (windows, 4.0.4)	3m 44s
specs (ubuntu, 4.0.4, LC_ALL=C)	1m 24s
specs (windows, 3.4.9)	2m 47s
specs (windows, 3.3.11)	3m 42s
specs (ubuntu, 4.0.4, --repeat 2)	2m 14s
specs (ubuntu, 3.3.11)	1m 32s
specs (ubuntu, 3.4.9)	1m 42s
specs (macos, 4.0.4)	1m 48s
specs (ubuntu, 4.0.4)	1m 39s
specs (macos, 3.3.11)	1m 41s
	27m 23s

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