chore: clean up fmt::Debug impls #371

Job	Run time
docs	22s
feature-checks	1m 3s
clippy	24s
fmt	11s
wasm	34s
test stable --no-default-features	59s
test stable	1m 2s
test stable --all-features	1m 17s
test beta --no-default-features	45s
test beta	44s
test beta --all-features	1m 2s
test nightly --no-default-features	44s
test nightly	57s
test nightly --all-features	1m 12s
test 1.68 --no-default-features	27s
test 1.68	28s
	12m 11s

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