Can we support `~==` for floating point comparison?

[davesmith00000]

It isn't GLSL, but it would be handy for simple colour value comparisons and such...

Usage:

if 1.0f ~== vec2(1.0f).x then ??? else ???

Which expands to something like:

if abs(1.0f - vec2(1.0f).x) < 0.001f then ??? else ???