[sage-devel] Faster coercions!

[Jeroen Demeyer]

This week I worked on the coercion model to make it faster. It turns out
that there was some margin for micro-optimizations. There are two
tickets in need of review: #26776 and #26790.

If you need to be convinced, run
sage: a = RR(25); b = ZZ(2)
sage: timeit('a+b', repeat=100, number=100000)

*Before*:
100000 loops, best of 100: 756 ns per loop

*After*:
100000 loops, best of 100: 636 ns per loop

This is a very nice gain for every single coercion(!) in Sage.