feat: better extra_args handling #772

Job	Run time
docs	29s
clippy	1m 2s
doctest	1m 40s
feature-checks	3m 30s
fmt	11s
test stable (ubuntu-latest)	1m 15s
test stable --all-features (ubuntu-latest)	2m 17s
test 1.70 (ubuntu-latest)	50s
test stable (macos-latest)	2m 5s
test stable --all-features (macos-latest)	2m 29s
test 1.70 (macos-latest)	1m 8s
test stable (windows-latest)	3m 39s
test stable --all-features (windows-latest)	4m 48s
test 1.70 (windows-latest)	3m 43s
	29m 6s

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