Array methods refactor #1603

Job	Run time
RuboCop	24s
specs (ubuntu, 3.0.6)	1m 33s
specs (ubuntu, 3.1.4)	1m 27s
specs (ubuntu, 3.2.2)	1m 25s
specs (ubuntu, 3.3.0)	1m 26s
specs (macos, 3.0.6)	1m 45s
specs (macos, 3.1.4)	1m 22s
specs (macos, 3.2.2)	1m 23s
specs (macos, 3.3.0)	1m 25s
specs (windows, 3.0.6)	3m 55s
specs (windows, 3.1.4)	5m 21s
specs (windows, 3.2.2)	5m 18s
specs (windows, 3.3.0)	6m 10s
specs (ubuntu, 3.3.0, --enable-frozen-string-literal)	1m 26s
	34m 20s

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