Fixed with 67795245fd9b17ca11036b63aa04e17deabb8e7a
Tests needed.
- [perl #125811] 2 ** 99999999999999999999999999999999999 ... via RT
- [perl #125811] 2 ** 9999999999999999999999999999999... Larry Wall via RT
Fixed with 67795245fd9b17ca11036b63aa04e17deabb8e7a
Tests needed.