Consider to move the crait in rust_num

[XVilka]

Since the decimal arithmetic is crucial for business and financial applications, it makes sense to improve the visibility and make it more abstract (i.e. split from Postgres feature), and move into https://github.com/rust-num organization

cc @rust-num

Might be useful to create a generic implementation.

[rubdos]

Some history here and mostly also here. TL;DR: this crate is a "testing ground" for what at first was num's implementation for BigDecimal. There are a few "competing" implementations iirc, and the goal was to see which ones worked best and to test their APIs.

Could you elaborate on "make it more abstract"? Also, there's no direct connection between PostgrSQL and this crate. The only thing I know is that diesel uses the crate to optionally represent Postgres' Decimal type.

[XVilka]

@rubdos, basically the idea is to create some predefined set of the libraries suitable for "business applications", and big decimal arithmetic is one of the cornerstones of such a platform: https://internals.rust-lang.org/t/proposal-business-applications-working-group/10400