IEEE754 is used at run time in 235 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
754K 16 robust optional ^0.2
90K 14 fast-math ^0.2.6
9.9K 6 accurate ^0.2
5.3K 60 rust-htslib ^0.2
3.6K 6 rmodbus ^0.2.6
170 6 ramp ^0.2
170 extended-htslib ^0.2
d4tools ^0.2.6
1 smartnoise_validator ^0.2.6
1 framp ^0.2
smartnoise_runtime ^0.2.6
whitenoise_runtime ^0.2.6
num-shaman ^0.2
sps30 ^0.2
4.1M 85 hdrhistogram dev ^0.2.2
34K 5 almost dev ^0.2.6
2 hdrsample dev ^0.2.2