`try_len` method #356

Job	Run time
test	1m 10s
check (msrv)	1m 32s
check (msrv, --no-default-features)	1m 31s
check (msrv, --no-default-features --features use_alloc)	1m 29s
check (stable)	16s
check (stable, --no-default-features)	19s
check (stable, --no-default-features --features use_alloc)	20s
check (stable, --all-targets --all-features)	34s
bors build finished	1s
	7m 12s

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