It would be good to get some consistency between the implementations: on the Python side, there is a lot of confusion, as the alignment parameter doesn’t really control text alignment in the expected way, but effectively moves the anchor point of the stimulus instead:
I would think that the text alignment parameter should do what people expect from a word processor (i.e. control the alignment of text within the bounds of the stimulus), while the anchor point should really just be controlled by the pos parameter.