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.
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