build

Allow disabling conversions #468

Job	Run time
build (ubuntu-latest)	2m 19s
build (windows-latest)	3m 23s
test (macos-latest, 1.61.0)	4m 32s
build-other (wasm32-unknown-unknown, 1.61.0)	4m 52s
test (macos-latest, stable)	52s
build-other (wasm32-unknown-unknown, stable)	1m 12s
test (macos-latest, beta)	54s
build-other (wasm32-unknown-unknown, beta)	1m 6s
test (macos-latest, nightly)	1m 13s
build-other (wasm32-unknown-unknown, nightly)	1m 39s
test (ubuntu-latest, 1.61.0)	4m 14s
build-other (wasm32-wasi, 1.61.0)	5m 59s
test (ubuntu-latest, stable)	33s
build-other (wasm32-wasi, stable)	59s
test (ubuntu-latest, beta)	40s
build-other (wasm32-wasi, beta)	58s
test (ubuntu-latest, nightly)	46s
build-other (wasm32-wasi, nightly)	1m 29s
test (windows-latest, 1.61.0)	6m 10s
build-other (x86_64-unknown-redox, 1.61.0)	4m 54s
test (windows-latest, stable)	1m 16s
build-other (x86_64-unknown-redox, stable)	1m 13s
test (windows-latest, beta)	56s
build-other (x86_64-unknown-redox, beta)	1m 6s
test (windows-latest, nightly)	1m 22s
build-other (x86_64-unknown-redox, nightly)	1m 18s
build-other (x86_64-fortanix-unknown-sgx, nightly)	1m 18s
	57m 13s

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