IEEE754 is used at run time in 234 crates (of which 13 optionally). It is a direct run-time dependency in 14 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
776K 16 robust optional ^0.2
76K 14 fast-math ^0.2.6
10K 6 accurate ^0.2
5.3K 60 rust-htslib ^0.2
3.4K 6 rmodbus ^0.2.6
290 extended-htslib ^0.2
220 6 ramp ^0.2
d4tools ^0.2.6
1 smartnoise_validator ^0.2.6
smartnoise_runtime ^0.2.6
num-shaman ^0.2
sps30 ^0.2
1 framp ^0.2
whitenoise_runtime ^0.2.6
2.6M 83 hdrhistogram dev ^0.2.2
35K 5 almost dev ^0.2.6
2 hdrsample dev ^0.2.2