Another thing I oversaw in my initial review - `feols` and `fepois` check input types in https://github.com/py-econometrics/pyfixest/blob/a3ed27aefef01e80ade7ebf117d5999239bbb62b/pyfixest/estimation/estimation.py#L617
Maybe we could update them to use the Literal validation function whenever relevant?
Maybe we could update them to use the Literal validation function whenever relevant?
Originally posted by @s3alfisc in https://github.com/py-econometrics/pyfixest/issues/680#issuecomment-2448462631