TYP: Type MaskedArray.ravel (numpy#28848)

Author: MarcoGorelli

numpy/ma/core.pyi

@@ -484,7 +484,7 @@ class MaskedArray(ndarray[_ShapeT_co, _DTypeT_co]):
     @overload
     def count(self, axis: _ShapeLike | None, keepdims: Literal[True]) -> NDArray[int_]: ...
 
-    def ravel(self, order=...): ...
+    def ravel(self, order: _OrderKACF = "C") -> MaskedArray[tuple[int], _DTypeT_co]: ...
     def reshape(self, *s, **kwargs): ...
     def resize(self, newshape, refcheck=..., order=...): ...
     def put(self, indices: _ArrayLikeInt_co, values: ArrayLike, mode: _ModeKind = "raise") -> None: ...

numpy/typing/tests/data/reveal/ma.pyi

@@ -283,6 +283,9 @@ assert_type(np.ma.allclose(AR_f4, MAR_f4), bool)
 assert_type(np.ma.allclose(AR_f4, MAR_f4, masked_equal=False), bool)
 assert_type(np.ma.allclose(AR_f4, MAR_f4, rtol=.4, atol=.3), bool)
 
+assert_type(MAR_2d_f4.ravel(), np.ma.MaskedArray[tuple[int], np.dtype[np.float32]])
+assert_type(MAR_1d.ravel(order='A'), np.ma.MaskedArray[tuple[int], np.dtype[Any]])
+
 assert_type(np.ma.getmask(MAR_f4), NDArray[np.bool] | np.bool)
 # PyRight detects this one correctly, but mypy doesn't:
 # `Revealed type is "Union[numpy.ndarray[Any, Any], numpy.bool[Any]]"`