Murisi/allowed conversion negation #563

Job	Run time
Bitrot check	55s
Build target wasm32-unknown-unknown	46s
Lint	48s
Nightly lint	13s
Build target wasm32-wasi	41s
Intra-doc links	1m 17s
Rustfmt	12s
Security - Cargo Audit	3m 7s
Test on ubuntu-latest	3m 9s
Test on windows-latest	7m 1s
Test on macOS-latest	2m 30s
	20m 39s

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