✨: add HasArrayLT protocol to support less-than operator for array classes

Author: nstarman

src/array_api_typing/_array.py

@@ -284,6 +284,22 @@ def __rshift__(self, other: Self | int, /) -> Self:
         ...
 
 
+class HasArrayLT(Protocol):
+    """Protocol for array classes that support the less-than operator."""
+
+    def __lt__(self, other: Self | int | float) -> Self:
+        """Computes the truth value of ``self_i < other_i`` for each element of an array instance with the respective element of the array other.
+
+        Args:
+            other: other array. Must be compatible with ``self`` (see Broadcasting). Should have a numeric data type.
+
+        Returns:
+            an array containing the element-wise results. The returned array must have a data type of bool.
+
+        """  # noqa: E501
+        ...
+
+
 class Array(
     HasArrayNamespace[NS_co],
     HasArrayPos,
@@ -302,6 +318,7 @@ class Array(
     HasArrayXOr,
     HasArrayLShift,
     HasArrayRShift,
+    HasArrayLT,
     Protocol,
 ):
     """Array API specification for array object attributes and methods."""