Add and update specs for IO methods #2495

Job	Run time
RuboCop	54s
specs (ubuntu, 3.3.11)	1m 13s
specs (windows, 4.0.4)	2m 43s
specs (ubuntu, 4.0.4, LC_ALL=C)	1m 29s
specs (ubuntu, 4.0.4, --enable-frozen-string-literal)	1m 17s
specs (macos, 3.3.11)	1m 48s
specs (ubuntu, 4.0.4)	1m 28s
specs (ubuntu, 3.4.9)	1m 37s
specs (windows, 3.3.11)	3m 24s
specs (macos, 3.4.9)	1m 56s
specs (macos, 4.0.4)	1m 49s
specs (ubuntu, 4.0.4, --repeat 2)	2m 13s
specs (ubuntu, 4.0.4, --parser=parse.y)	1m 37s
specs (windows, 3.4.9)	3m 18s
	26m 46s

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