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Add `simplifyFileSize` option #36

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Job	Run time
test (Node.js 0.8)	13s
test (Node.js 0.10)	14s
test (Node.js 0.12)	15s
test (io.js 1.x)	15s
test (io.js 2.x)	17s
test (io.js 3.x)	18s
test (Node.js 4.x)	14s
test (Node.js 5.x)	16s
test (Node.js 6.x)	20s
test (Node.js 7.x)	19s
test (Node.js 8.x)	16s
test (Node.js 9.x)	17s
test (Node.js 10.x)	20s
test (Node.js 11.x)	16s
test (Node.js 12.x)	16s
test (Node.js 13.x)	15s
test (Node.js 14.x)	14s
test (Node.js 15.x)	14s
test (Node.js 16.x)	15s
test (Node.js 17.x)	16s
test (Node.js 18.x)	15s
test (Node.js 19.x)	15s
test (Node.js 20.x)	20s
test (Node.js 21.x)	17s
test (Node.js 22.x)	15s
coverage	0s
	6m 42s