feat: modify expander trait to use references #1706

Job	Run time
fmt	15s
docs	51s
clippy	1m 3s
feature-checks	3m 32s
miri --no-default-features	4m 11s
wasm	44s
miri	4m 8s
miri --all-features	4m 59s
test stable --no-default-features	1m 2s
test stable	1m 8s
test stable --all-features	1m 25s
test beta --no-default-features	1m 21s
test beta	1m 3s
test beta --all-features	1m 20s
test nightly --no-default-features	1m 42s
test nightly	1m 39s
test nightly --all-features	2m 3s
test 1.65 --no-default-features	1m 29s
test 1.65	1m 11s
test 1.65 --features json	1m 15s
	36m 21s

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