Assertion failure in _setGlyphMargin

[simoncozens]

The dottedCircle filter is dying for me, and the reason seems to be due to this assert in _setGlyphMargin:

    if hasattr(glyph, f"set{side.title()}Margin"):  # ufoLib2
        getattr(glyph, f"set{side.title()}Margin")(margin)
        assert getattr(glyph, f"get{side.title()}Margin")() == margin

In [5]: glyph.setRightMargin(160)

In [6]: glyph.getRightMargin()
Out[6]: 160.00000000000003

I don't know why ufoLib2 is doing that, but maybe the assert should be loosened to within epsilon?

[anthrotype]

looks like it's using getBounds (the actual bounds, not the control points bounding box which are usually rounded to int already) to set the right margin here:

https://github.com/fonttools/ufoLib2/blob/9a238a627adc9a756eed9fd82a88e2b1858be18d/src/ufoLib2/objects/glyph.py#L507

it's probably as intended and to match defcon API so that should probably stay as is.
The assertions should probably just be removed altogether. It's as if we don't trust our own libs.. PR?

[anthrotype]

@simoncozens I pushed a bugfix release v3.2.5, should be published shortly