sealed: add more functions (#2) #52

Job	Run time
Build release (ubuntu-latest)	18s
Build release (windows-latest)	1m 10s
Run tests (ubuntu-latest)	25s
Run tests (windows-latest)	1m 4s
Check formatting	8s
Lint	15s
Run doc tests	26s
Code coverage	31s
	4m 17s

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