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Reproducible Example

from pandas import NA, Series
from numpy import nan

s1 = Series([1.0, NA, 2.0])
s2 = Series([1.0, nan, 2.0])
s3 = Series([1.0, None, 2.0])

s1.interpolate()  # Series([1.0, NA, 2.0])
s2.interpolate()  # Series([1.0, 1.5, 2.0])
s3.interpolate()  # Series([1.0, 1.5, 2.0])

Issue Description

This actually works:

s = Series([1, NA, 2], dtype=pd.Float64Dtype())
s.interpolate("ffill")

But there are also error messages about interpolation methods that are not documented in Series.interpolate.
You cannot linearly interpolate over Float64Dtype though.

Expected Behavior

Similar to underlying None and nan versions.

Installed Versions