Абмеркаванне

So build speed is basically solved now.

@vitaut

As it is supposed to.
20% is a bit on the low side, though, given all the template stuff you have.

@DanielaKEngert fmt/core.h is very lightweight

@vitaut

Aren't you speaking about entire {fmt}?

@vitaut
The key idea of modules is to precompile as much as you can:
- the implementation
- the intented API
- the accidental/unavoidable API 😮
- lots of name lookup
- lots of name resolution
- lots of template specializations and instantiations

Hence, make modules reasonably big.

@DanielaKEngert I mostly agree although there is nuance as sometimes precompilation can slow things down

@DanielaKEngert module includes everything but the benchmark compares against the core API which covers most of the usage