Remove mutable arguments from Particle.is_category
method
#751
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I noticed that there are mutable arguments in
Particle.is_category
method, that should never be done.Nice article about its 'features' --> https://florimond.dev/blog/articles/2018/08/python-mutable-defaults-are-the-source-of-all-evil/
So the mutable arguments are removed and replaced by
None
with handling bybecome_set
similarly as it was before.