pint.dequantify() fails for duplicate column names

[mmarras]

df.pint.dequantify() breaks unexpectedly (and error msg is cryptic) if column names contain duplicates.

df = pd.DataFrame()
df['test']= pd.Series([1,2,3], dtype='pint[kN]')
df.insert(0,'test',df['test'],allow_duplicates=True)

df:

	test	test
0	1	1
1	2	2
2	3	3

df.iloc[:,1:].pint.dequantify()

--| test --|-- unit| kN 0|1 1|2 2|3

df.pint.dequantify()

'DataFrame' object has no attribute 'dtype'

pint_pandas.version = 0.4, python 3.10