fix: cast overflow in 32-bits OS #2391

Job	Run time
check no-default-features	15s
check serde	18s
check std	14s
clippy	1m 12s
docs	1m 14s
fmt	10s
test stable --no-default-features	47s
test no_std	30s
test stable	53s
test stable --all-features	49s
test beta --no-default-features	46s
test beta	51s
test beta --all-features	1m 4s
test nightly --no-default-features	56s
test nightly	51s
test nightly --all-features	50s
	11m 40s

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