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Since I’m interested in using Python with gomix I’d just like to add that it’s the default for Python to use four spaces, so I’m not sure how well this opinionated stance will hold outside of Javascript and maybe Ruby. It might just be me, but since proper Python code has four spaces I would probably still use those for Python code, even if it means double-tabbing in your editor. Especially if I’m creating a mix for educational purposes.
Someone copying over my example to a proper Python codebase would have to use four spaces anyway, to not go against the grain.
Therefore, if the spacing is fixed it should probably be configured on a per-language basis. Though you basically enter the same rabbit hole again.