Integral Literals are int64 or uint64

In Texis version 8 and later, integral literals become int64 fields, or if out of range of that type but in range of uint64, become uint64 fields. Integral literals out of range of both types cause an error and statement failure. In previous Texis versions, integral literals became long fields, and values out of range were silently cast to long with possible rollover, or became NULL. Using int64/uint64 instead of long provides consistency across platforms, as the size of long can vary.