feat: better extra_args handling #770

Job	Run time
doctest	1m 29s
clippy	1m 4s
docs	25s
feature-checks	3m 30s
fmt	11s
test stable (ubuntu-latest)	1m 23s
test stable --all-features (ubuntu-latest)	2m 22s
test 1.70 (ubuntu-latest)	48s
test stable (macos-latest)	1m 46s
test stable --all-features (macos-latest)	2m 57s
test 1.70 (macos-latest)	1m 0s
test stable (windows-latest)	4m 6s
test stable --all-features (windows-latest)	5m 41s
test 1.70 (windows-latest)	2m 7s
	28m 49s

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