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add `prepend` option #550

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Run time

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Job	Run time
rspec (3.4, yes)	18s
rspec (3.4, no)	16s
rspec (3.3, yes)	17s
rspec (3.3, no)	17s
rspec (3.2, yes)	25s
rspec (3.2, no)	17s
rspec (3.1, yes)	23s
rspec (3.1, no)	14s
	2m 27s