Make core more robust. #756

Job	Run time
Rust check	19s
Rust format	17s
Rust check with default features	20s
Rust test	1m 37s
Rust doc	1m 40s
Rust check (macos-latest)	40s
Rust lint (nightly)	20s
Rust check (windows-latest)	1m 20s
Rust lint (stable)	24s
Rust lint (beta)	28s
Rust lint	25s
	7m 50s

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