`try_len` method #354

Job	Run time
test	1m 32s
check (msrv)	1m 47s
check (msrv, --no-default-features)	1m 26s
check (msrv, --no-default-features --features use_alloc)	1m 45s
check (stable)	19s
check (stable, --no-default-features)	16s
check (stable, --no-default-features --features use_alloc)	33s
check (stable, --all-targets --all-features)	28s
bors build finished	1s
	8m 7s

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