use on_setattr to auto-convert dict to Lib and Kerning #188
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This was referenced Dec 16, 2021
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One can use
on_setattr=attrs.setters.converton a field that has an attrs converter defined (e.g. Font.lib or Glyph.lib) to run the field converter whenever the attribute is set, not just at default constructor time.It's a nice feature, allows to remove the property getter/setter boilerplate, and it's actually a bit faster to get/set the field compared to the properties.
But mypy doesn't like it.. python-attrs/attrs#889