[azakai]

First, haXe describes itself as a programming language.

Second, I don't see a mention of a physics engine builtin to haXe anywhere on the features page,

http://haxe.org/doc/features

where are you seeing that?

[rufugee]

You're correct. I saw this earlier, but apparently it's not included in Haxe core:

http://haxe.org/com/libs/physaxe

[dsirijus]

Arguably the best 2d physics engine, http://deltaluca.me.uk/ is made with HaXe.

[azakai]

Better than Box2D..? (C++, various ports)

[dsirijus]

Yeah, played with both.