diff --git a/pyproject.toml b/pyproject.toml
index 914ce17e..68d9854f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -111,6 +111,14 @@ reportUnusedCallResult = "none"
 reportExplicitAny = "none"
 reportUnreachable = "hint"
 
+exclude = [
+    "doc",
+    ".conda-root",
+    "build",
+    ".env",
+    ".run-pylint.py",
+]
+
 # This reports even cycles that are qualified by 'if TYPE_CHECKING'. Not what
 # we care about at this moment.
 # https://github.com/microsoft/pyright/issues/746
diff --git a/pytools/__init__.py b/pytools/__init__.py
index 904b8662..433cbcad 100644
--- a/pytools/__init__.py
+++ b/pytools/__init__.py
@@ -3169,6 +3169,11 @@ def ndindex(shape: ShapeT) -> Iterable[ShapeT]:
     return np.ndindex(shape)
 
 
+def not_none(obj: T | None) -> T:
+    assert obj is not None
+    return obj
+
+
 def _test():
     import doctest
     doctest.testmod()
diff --git a/pytools/obj_array.py b/pytools/obj_array.py
index d50c1a4e..d6555144 100644
--- a/pytools/obj_array.py
+++ b/pytools/obj_array.py
@@ -173,6 +173,12 @@ def __getitem__(self: ObjectArray2D[T], x: int, /) -> ObjectArray1D[T]: ...
         @overload
         def __getitem__(self: ObjectArrayND[T], x: int, /) -> ObjectArrayND[T] | T: ...
 
+        @overload
+        def __getitem__(
+                self: ObjectArrayND[T],
+                x: tuple[int | slice, ...],
+            /) -> ObjectArrayND[T] | T: ...
+
         @overload
         def __getitem__(
             self: ObjectArray1D[T],
@@ -271,6 +277,12 @@ def __matmul__(
                     other: ObjectArray2D[T],
                 /) -> ObjectArray2D[T]: ...
 
+        @overload
+        def __matmul__(
+                    self: ObjectArrayND[T],
+                    other: ObjectArrayND[T],
+                /) -> ObjectArrayND[T] | T: ...
+
         @property
         def flat(self) -> ObjectArray1D[T]: ...