Piotr Fila

@huonw any chance of merging? I was working on no-std support for another crate and this is a dependency. I would appreciate the changes being published to crates.io so that...

@skewballfox feel free, I've moved on to other things:) I agree that it's usually better to have a std rather than no-std feature. I chose to do it this way...

Thanks a lot! The crate now compiles on `thumbv7em-none-eabihf` with the libm feature enabled. I decided to move libm into its own feature because as you said it is likely...

My primal-check fix was just meant to get the crate to compile on no-std, so yeah it's not great :upside_down_face:. I see now that this is quite a bit more...

Another issue I found when compiling for `thumbv6m-none-eabi` (pi pico board, Arm M0+) is that not all targets support `Arc`. This can be mitigated by using [portable-atomic](https://github.com/taiki-e/portable-atomic), though I could...