As of 1d6dbb, the behaviour, documentation, and signatures for to_dense are widely inconsistent:
SparseArray: documentation is incorrect (we are not converting a SparseSeries), and the fill parameter is not even respected if you trace the code. Not sure why it was ever there in the first place.
SparseSeries: What is the purpose of sparse_only? Not only is it not documented, but it also is inconsistent with SparseArray behaviour.
SparseDataFrame: Perhaps the most intuitive of them all. Documentation is correct, and it has no unnecessary parameters like the other two do.
I propose that we change the to_dense behaviour to match that of SparseDataFrame. Take no arguments and just convert to a dense object with no questions asked.
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