Drive-by: no need to qualify this.
Checkpoint on extensible PseudoKeys.

Repeat after me kids: Fuck static singletons.
You can always have a static variable that POINTS to your fucking singleton.
But to make a class that just has a bunch of static methods on it
means zero extensibility. You'd better be damn sure.
Better yet: DON'T.

Worse yet, Lars added static *state* to the class.

PseudoKeys is pretty deeply embedded in PX, it'd be a pain to change.
Although maybe I still will...

Here instead is a first pass. Made non-static, but the singleton
is still there accessed by a static method.