Move signature types to a subpackage

Author: NeilGirdhar

src/array_api_typing/__init__.py

@@ -6,15 +6,14 @@
     "DType",
     "Device",
     "HasArrayNamespace",
-    "NestedSequence",
-    "SupportsBufferProtocol",
     "__version__",
     "__version_tuple__",
+    "signature_types",
 ]
 
+from . import signature_types
 from ._array import Array
 from ._device import Device
 from ._dtype import DType
 from ._namespace import ArrayNamespace, HasArrayNamespace
-from ._simple import NestedSequence, SupportsBufferProtocol
 from ._version import version as __version__, version_tuple as __version_tuple__

src/array_api_typing/_namespace.py

@@ -6,7 +6,7 @@
 from ._array import Array
 from ._device import Device
 from ._dtype import DType
-from ._simple import NestedSequence, SupportsBufferProtocol
+from .signature_types import NestedSequence, SupportsBufferProtocol
 
 A = TypeVar("A", bound=Array, default=Array)  # PEP 696 default
 

src/array_api_typing/signature_types/__init__.py

@@ -0,0 +1,8 @@
+"""Types that appear in public function signatures."""
+
+__all__ = [
+    "NestedSequence",
+    "SupportsBufferProtocol",
+]
+
+from ._signature_types import NestedSequence, SupportsBufferProtocol

src/array_api_typing/_simple.py renamed to src/array_api_typing/signature_types/_signature_types.py

@@ -1,5 +1,3 @@
-"""Static typing support for the array API standard."""
-
 from __future__ import annotations
 
 from typing import Any, Protocol, TypeAlias, TypeVar