- Faster algorithm in Number `make_coprime(a,b)`.
- Faster algorithm in Number `make_coprime(a,b)`.

Example:

	say make_coprime(50!, 10!)		   #=> 4892976165968296476364151
	say make_coprime(2**256 - 1, 2**128 + 1)   #=> 340282366920938463463374607431768211455

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