_replace_nan(a, val)
Note that scalars will end up as array scalars, which is important for using the result as the value of the out argument in some operations.
If a is of inexact type, return a copy of a with the NaNs replaced by the fill value, otherwise return a.
If a is of inexact type, return a boolean mask marking locations of NaNs, otherwise return None.
If a is of inexact type, make a copy of a, replace NaNs with the :None:None:`val` value, and return the copy together with a boolean mask marking the locations where NaNs were present. If a is not of inexact type, do nothing and return a together with a mask of None.
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