There's a nice explanation for this in Pandas' FAQ: https://pandas.pydata.org/pandas-docs/stable/user_guide/gotchas.html#support-for-integer-na https://pandas.p

There's a nice explanation for this in Pandas' FAQ: https://pandas.pydata.org/pandas-docs/stable/user_guide/gotchas.html#support-for-integer-na https://pandas.pydata.org/pandas-docs/stable/user_guide/gotc... Not allowing nullable type in raw integer `Series` is the least bad solution this problem. If you really want nulls in numerical data, either use floating point or `IntegerArray`.