Support hi/lo on literals

[agg23]

Minor feature request, but it would be nice to either use .hi/.lo or some other syntax to get the literal high or low bytes of a literal. I ran into this while implementing a hex to dec conversion algorithm, where I wrote 400.lo, 400.hi in constructing a table.

[KarolS]

I'll consider it, it would be a bit more consistent that way. Right now, hi(400) and lo(400) should work.