chore: swap blockenv values instead of cloning (#10) #45

Job	Run time
doctest	33s
docs	34s
clippy	30s
feature-propagation	48s
check no_std	18s
fmt	13s
wasm-unknown	38s
test ubuntu-latest stable --no-default-features	31s
wasm-wasi	33s
test ubuntu-latest stable	33s
feature-checks	37s
test ubuntu-latest stable --all-features	38s
test ubuntu-latest nightly --no-default-features	38s
test ubuntu-latest nightly	39s
test ubuntu-latest nightly --all-features	39s
test ubuntu-latest 1.81 --no-default-features	28s
test ubuntu-latest 1.81	32s
test windows-latest stable --no-default-features	1m 14s
test windows-latest stable	1m 51s
test windows-latest stable --all-features	1m 33s
test windows-latest nightly --no-default-features	1m 32s
test windows-latest nightly	1m 49s
test windows-latest nightly --all-features	1m 35s
test windows-latest 1.81 --no-default-features	1m 26s
test windows-latest 1.81	1m 39s
deny / cargo deny check	18s
ci success	1s
	22m 20s

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