[REWORK] Potentially use haxe's AST types?

[lemz1]

Note: This issue is more of a question/discussion than a problem with polymod.

I wondered if it would be better use haxe's builtin Expr, Type, etc. types, that are inside haxe.macro.Expr, haxe.macro.Type, etc.
Since hscript is trying to emulate haxe's AST anyways, why not just use them?

I would think that this has an advantage because it makes it easier to make hscript more accurate, since we use the exact same format that the haxe compiler uses.