Support uint64 literals #6145
Description
Is your feature request related to a problem or challenge?
It is not possible to provide numeric literals greater than int64 max without them being treated as either float (lossy) or decimal (not currently castable to uint64)
Describe the solution you'd like
We should attempt to parse uint64s after int64 parsing fails, but before falling back to float or decimal
Describe alternatives you've considered
I looked at using decimals, but this would require another change to make it possible to cast uint64 to decimal
Additional context
No response