Test

`Head.for(nil)` -> `nil`. #503

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Run time

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Job	Run time
truffleruby on ubuntu	1m 8s
3.4 on ubuntu	41s
3.2 on macos	37s
3.3 on macos	32s
3.4 on macos	36s
3.2 on ubuntu	43s
jruby on ubuntu	57s
3.3 on ubuntu	42s
head on ubuntu	39s
	6m 35s