make dtype and shape setters positional-only, remove unnecessary __int__ and __float__

Author: MarcoGorelli

numpy/ma/core.pyi

@@ -351,11 +351,11 @@ class MaskedArray(ndarray[_ShapeType_co, _DType_co]):
     @property
     def dtype(self) -> _DType_co: ...
     @dtype.setter
-    def dtype(self: MaskedArray[_ShapeType_co, _DType], dtype: _DType) -> None: ...
+    def dtype(self: MaskedArray[_ShapeType_co, _DType], dtype: _DType, /,) -> None: ...
     @property
     def shape(self) -> _ShapeType_co: ...
     @shape.setter
-    def shape(self: MaskedArray[_ShapeType, _DType_co], shape: _ShapeType) -> None: ...
+    def shape(self: MaskedArray[_ShapeType, _DType_co], shape: _ShapeType, /,) -> None: ...
     def __setmask__(self, mask, copy=...): ...
     @property
     def mask(self): ...
@@ -415,8 +415,6 @@ class MaskedArray(ndarray[_ShapeType_co, _DType_co]):
     def __ifloordiv__(self, other): ...
     def __itruediv__(self, other): ...
     def __ipow__(self, other): ...
-    def __float__(self) -> float: ...
-    def __int__(self) -> int: ...
     @property  # type: ignore[misc]
     def imag(self): ...
     get_imag: Any