Added a new elif condition to handle integer arrays. If the array's d…

…ata type kind is "i" (signed integer) or "u" (unsigned integer), the indices variable is directly assigned the array value.

Updated the else condition to raise a ValueError only for unsupported array data types that are not handled by the previous conditions.

policyengine_core/enums/enum.py

@@ -70,6 +70,9 @@ def encode(cls, array: Union[EnumArray, np.ndarray]) -> EnumArray:
                 [array == item for item in cls],
                 [item.index for item in cls],
             )
+        elif array.dtype.kind in {"i", "u"}:
+            # Integer array
+            indices = array
         else:
             raise ValueError(f"Unsupported array dtype: {array.dtype}")