human
I wrote the below code

    if mask.any():
        if is_datetimelike(result.dtype):
            if is_scalar(other):
                if isna(other):
                    other = result.dtype.type('nat')
                elif is_integer(other):
                    other = np.array(other, dtype=result.dtype)
            elif is_integer_dtype(other):
                other = np.array(other, dtype=result.dtype)
        def changeit():
            try:
                om = other[mask]
                om_at = om.astype(result.dtype)
                if (om == om_at).all():
                    new_result = result.values.copy()
                    new_result[mask] = om_at
                    result[:] = new_result
                    return (result, False)
            except:
                pass
            (r, _) = maybe_upcast(result, fill_value=other, copy=True)
            np.place(r, mask, other)
            return (r, True)
        (new_dtype, _) = maybe_promote(result.dtype, other)
        if (new_dtype != result.dtype):
            if (is_scalar(other) or (isinstance(other, np.ndarray) and (other.ndim < 1))):
                if isna(other):
                    return changeit()
            elif isna(other[mask]).any():
                return changeit()
        try:
            np.place(result, mask, other)
        except:
            return changeit()
    return (result, False)

What's a good function header?

=====
Here's a good function header?
assistant
#Here's a good function header.

def maybe_upcast_putmask(result, mask, other):