docs: specify the behavior of clip() when one of the operands is NaN

PR-URL: #813
Reviewed-by: Athan Reines <kgryte@gmail.com>
Reviewed-by: Ralf Gommers <ralf.gommers@gmail.com>

Author: asmeurer

src/array_api_stubs/_2023_12/elementwise_functions.py

@@ -807,6 +807,12 @@ def clip(
     - If a broadcasted element in ``min`` is greater than a corresponding broadcasted element in ``max``, behavior is unspecified and thus implementation-dependent.
     - If ``x`` and either ``min`` or ``max`` have different data type kinds (e.g., integer versus floating-point), behavior is unspecified and thus implementation-dependent.
 
+    **Special cases**
+
+    - If ``x_i`` is ``NaN``, the result is ``NaN``.
+    - If ``min_i`` is ``NaN``, the result is ``NaN``.
+    - If ``max_i`` is ``NaN``, the result is ``NaN``.
+
     .. versionadded:: 2023.12
     """
 

src/array_api_stubs/_draft/elementwise_functions.py

@@ -809,6 +809,12 @@ def clip(
     - If a broadcasted element in ``min`` is greater than a corresponding broadcasted element in ``max``, behavior is unspecified and thus implementation-dependent.
     - If ``x`` and either ``min`` or ``max`` have different data type kinds (e.g., integer versus floating-point), behavior is unspecified and thus implementation-dependent.
 
+    **Special cases**
+
+    - If ``x_i`` is ``NaN``, the result is ``NaN``.
+    - If ``min_i`` is ``NaN``, the result is ``NaN``.
+    - If ``max_i`` is ``NaN``, the result is ``NaN``.
+
     .. versionadded:: 2023.12
     """