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> A few languages do as well...

Specifically?

(I am pretty sure GHC uses GMP for its core math routines, though.)

> GHC uses GMP

Exactly, so I don't understand in what sense we could say GHC is an example of languages that "do as well with their native numerical tower"?

It is GMP, but the programmer doesn't know that. It is simply a good implementation choice (for speed, anyway), which is what the benchmark measures.