Tests

many fix and more assert (#7) #21

# to view logs

Job	Run time
check serde	24s
check no-default-features	21s
check std	17s
test stable --no-default-features	52s
test no_std	26s
clippy	2m 27s
test stable	1m 7s
test stable --features="all, scroll"	1m 31s
docs	1m 6s
test stable --features="all, optimism"	1m 21s
fmt	7s
test beta --no-default-features	58s
test beta	54s
test beta --features="all, scroll"	1m 29s
test beta --features="all, optimism"	1m 26s
test nightly --no-default-features	2m 7s
test nightly	2m 17s
test nightly --features="all, scroll"	2m 12s
test nightly --features="all, optimism"	2m 14s
	23m 36s

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