They look very nice. Does the STM32F405 have Neon SMD instructions?

The LGPL is an issue... we can't just include it in the uPy source tree.

no it doesn't, VFP/some SIMD instructions only, but this has all the math functions we might ever need (and will compile for other platforms) why can't we use LGPL ?

We can't include LGPL source in the repo here, nor modify that source and use it, unless we convert to LGPL. We can link against it, but that's it.

Musl is MIT and includes all math functions, written in C. We could use that.

it might be worth building as a library if MP is ported to a platform with Neon ? could be used to implement something like numpy maybe ? anyway, I will close this now since it's not very useful at the moment.