Enhacement: desugaring for number literals

[matiwinnetou]

Feature request, something like literals for values, instead of:

min_bid: 1000000

would be nice to write:

min_bid: 1_000_000 or even

min_bid: 1 mln as a string literal which would desugar into 1000000

[rvcas]

This is the plan already. Along with Ob1011, 0o12, and 0xAABC