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Showing content from https://github.com/pandas-dev/pandas/issues/32878 below:

should ComplexBlock._can_hold_element/should_store check itemsize? · Issue #32878 · pandas-dev/pandas · GitHub

arr = np.arange(5).astype("c8")
ser = pd.Series(arr)
val = np.finfo(np.float64).max
val = val.astype("c16")

>>> val
(1.7976931348623157e+308+0j)

ser[0] = val

>>> ser
0             inf+0.000000e+00j
1    1.000000e+00+0.000000e+00j
2    2.000000e+00+0.000000e+00j
3    3.000000e+00+0.000000e+00j
4    4.000000e+00+0.000000e+00j
dtype: complex64

For IntBlock we check the itemsize to avoid overflows, but for FloatBlock and ComplexBlock we do not, so we get the inf here. Should we instead be upcasting?

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