perf: write into arrayvec directly (#15) #49

Job	Run time
feature checks	14s
docs	16s
clippy	16s
fmt	12s
check WASM	6s
test stable --no-default-features	11s
test stable	15s
test stable --all-features	13s
test beta --no-default-features	18s
test beta	16s
test beta --all-features	16s
test nightly --no-default-features	15s
test nightly	14s
test nightly --all-features	26s
test 1.64 --no-default-features	1m 37s
test 1.64	1m 36s
test 1.64 --all-features	1m 35s
	8m 16s

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