Is the licence zlib or zlib-acknowledgement?

[emilk]

Your SPDX is zlib-acknowledgement:

https://github.com/fulmicoton/fastdivide/blob/master/Cargo.toml#L5

But your LICENCE.txt is the normal zlib license: https://github.com/fulmicoton/fastdivide/blob/master/LICENSE.txt

So which one is it?

I would personally prefer the more permissible zlib 🙏 , i.e.:

- license = "zlib-acknowledgement"
+ license = "zlib"
+ license-file = "LICENSE.txt"

[fulmicoton]

I won't change the license to zlib (because I don't have time to research the hidden implications) but I added MIT as an alternative.