Series of just None not converted to NaN

[hayd]

I was a little surprised by this

In [11]: pd.Series([])
Out[11]: Series([], dtype: float64)

In [12]: pd.Series([None])  # should be NaN / float ?
Out[12]:
0    None
dtype: object

In [13]: pd.Series([None, 1])
Out[13]:
0   NaN
1     1
dtype: float64

[jreback]

somewhat related to #7941. I think this should be Nan (for a single None) to be consistent.

[jorisvandenbossche]

We recently discussed this in #13894, where we sort of decided to not change this at the moment.
So closing this, although we should maybe reconsider this somewhere for pandas 2.0 how to handle 'None'.