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73416ba
(Get the code!)
I'm afraid I'm not sure. This is all new to me, I'm just investigating because I follow the pygame mailing list and found it interesting.
I do think it's interesting that the variation appears always to be +/-1 pixel, regardless of the scaling factor. I'll perhaps try some much larger scales and see if that pattern holds up.
I think at this point it might be worth discussing on the SDL and FreeType mailing lists. I'm not sure what FreeType functions SDL uses to determine an advance in pixels, and I still don't quite understand what information FreeType uses from the font file to determine advance widths.