Fewer duplicate specs for `Kernel` methods #2463

Job	Run time
RuboCop	53s
specs (macos, 3.3.11)	1m 28s
specs (windows, 3.4.9)	3m 47s
specs (ubuntu, 4.0.4, LC_ALL=C)	1m 32s
specs (ubuntu, 4.0.4)	1m 26s
specs (ubuntu, 4.0.4, --parser=parse.y)	1m 29s
specs (ubuntu, 4.0.4, --repeat 2)	2m 8s
specs (ubuntu, 3.4.9)	1m 35s
specs (macos, 3.4.9)	1m 41s
specs (ubuntu, 3.3.11)	1m 32s
specs (windows, 3.3.11)	3m 6s
specs (macos, 4.0.4)	1m 57s
specs (windows, 4.0.4)	4m 0s
specs (ubuntu, 4.0.4, --enable-frozen-string-literal)	1m 33s
	28m 7s

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