Merge pull request #339 from linebender/fromf32 #469

Job	Run time
cargo test msrv	3m 28s
cargo fmt	5s
Docs (macOS-latest)	32s
cargo test nightly (macOS-latest)	47s
Docs (windows-2019)	2m 26s
cargo test nightly (windows-2019)	49s
cargo clippy+test (macOS-latest)	1m 54s
Docs (ubuntu-latest)	14s
cargo test nightly (ubuntu-latest)	25s
cargo clippy+test (wasm32) (macOS-latest)	49s
cargo clippy+test (windows-2019)	1m 51s
cargo clippy+test (wasm32) (windows-2019)	1m 46s
cargo clippy+test (ubuntu-latest)	40s
cargo clippy+test (wasm32) (ubuntu-latest)	29s
	16m 15s

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