Continuous integration

Implement `Error.isError` #12690

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Run time

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Job	Run time
Fuzzing	1m 9s
Build & run examples	5m 59s
Lint	1m 12s
Coverage	5m 58s
Documentation	1m 19s
Formatting	28s
MSRV	2m 4s
Test (macos-latest)	3m 31s
Test (windows-latest)	3m 30s
	25m 10s