[BUG] Fix predict_residuals
internal data type conversion
#4772
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Fixes #4766
The
predict_residuals
internal calculation of residuals could break due to different data types for the observed and the predicted, as in some cases the observed would be obtained fromself._y
which can be data type coerced.The "optimal" solution would be to not do any coercion or conversion, but for now this should be fixed by converting to the predicted which has the data type consistent with the
fit
input.