Extend guide section on classes regarding free functions #3243
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It might not be obvious from the reading the sections on free functions and on classes that they combine in a frictionless manner, i.e. class instances can be parameters to free functions in the same manner that the self parameters of instance methods are handled.
This also explicitly calls out the interaction between
Clone
andFromPyObject
for classes.Closes #1059
cc @facundo-villa