Revert "Revert "math.parser: faster hex-string conversions with less bounds checking.""
Revert "Revert "math.parser: faster hex-string conversions with less bounds checking.""

This reverts commit 44d403230f8ccca79c95116ee57504a134e9e502.

mrjbq7/factor,mrjbq7/factor,mrjbq7/factor,tgunr/factor,factor/factor,tgunr/factor,tgunr/factor,factor/factor,factor/factor,tgunr/factor,factor/factor,tgunr/factor,factor/factor,mrjbq7/factor,mrjbq7/factor,factor/factor,mrjbq7/factor,tgunr/factor