I reported a Bignums problem maybe 6-8 months ago, I think I've run into another.
Snap thinks that 1^19 + 7^19 = 7^19. Adding Use Bignums doesn't fix it. Dropping the exponent to 18 does fix it.
In this longer version I try to set the results of the exponentiation to intermediate variables, hoping that they'll each get stored into Bignums and make it work, like maybe if Bignums only get created after all the snap Operations blocks have overflowed ints into floats.
