support for arbitrary precision libraries

[SkipMike]

I'm working on a point-of-sale (POS), and we have extensive use of arbitrary precision arithmetic. I'm wondering if it's possible to get support for deserializing Decimal structs into similar things on the rust side.

A couple of ideas, on the elixir side decimal is turned into a String which is then deserialized into the appropriate struct on the rust side. There are several arbitrary precision arithmetic libraries on the rust side (rug, rust-gmp, etc...) but some of them use serde so I wonder if that would work nicely into this library.