feyncalc
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ExpandPartialD messes up products of fields with Dirac indices
This code is not really compatible with fermion fields:
https://github.com/FeynCalc/feyncalc/blob/ca803c11325273e39ee1fecb951c6bd9866e74c2/FeynCalc/Feynman/ExpandPartialD.m#L266-L270
Ideas: Check for Dirac indices, introduce dedicated DataType
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