IEEE754 is used at run time in 232 crates (of which 14 optionally). It is a direct run-time dependency in 15 crates. It's used only as a dev dependency in 26 crates (of which 3 directly).

Depender (with downloads and own rev deps) IEEE754 version
394K 15 robust optional ^0.2
89K 14 fast-math ^0.2.6
9.5K 5 accurate ^0.2
7.6K 59 rust-htslib ^0.2
2.2K 6 rmodbus ^0.2.6
210 6 ramp ^0.2
extended-htslib ^0.2
d4tools ^0.2.6
1 smartnoise_validator ^0.2.6
smartnoise_runtime ^0.2.6
whitenoise_runtime ^0.2.6
1 fidget ^0.2
num-shaman ^0.2
sps30 ^0.2
1 framp ^0.2
1.7M 81 hdrhistogram dev ^0.2.2
27K 5 almost dev ^0.2.6
2 hdrsample dev ^0.2.2