impl CordicNumber for FixedI128

[lemmih]

Hi, are there any hidden pitfalls for implementing CordicNumber for FixedI128?

[yasammez]

It seems that the reason is that the code which builds the cordic tables uses the builtin floating point types and Rust doesn't have f128 in stable yet (cf. rust-lang/rust#116909 ). Once that feature lands, I'd be willing to give it a shot.

Also, I wonder if the tables can be built at compile time by a const function or macro.