[fix] Copy of #11 with fix included

tools.py

@@ -33,8 +33,7 @@ def new_input_types(*args, **kwargs):
             # Reflection is used to determine what the function signature is, so we can't just change the function signature
             raise NotImplementedError("VariantSupport does not support VALIDATE_INPUTS yet")
         else:
-            def validate_inputs(input_types):
-                inputs = cls.INPUT_TYPES()
+            def validate_individual(input_types, inputs):
                 for key, value in input_types.items():
                     if isinstance(value, SmartType):
                         continue
@@ -47,6 +46,19 @@ def validate_inputs(input_types):
                     if expected_type is not None and MakeSmartType(value) != expected_type:
                         return f"Invalid type of {key}: {value} (expected {expected_type})"
                 return True
+            def validate_inputs(input_types):
+                inputs = cls.INPUT_TYPES()
+
+                if not isinstance(input_types, list):
+                    return validate_individual(input_types, inputs)
+
+                for input_type in input_types:
+                    response = validate_individual(input_type, inputs)
+                    if isinstance(response, str):
+                        return response
+
+                return True
+
             setattr(cls, "VALIDATE_INPUTS", validate_inputs)
         return cls
     return decorator

utility_nodes.py

@@ -117,7 +117,7 @@ def INPUT_TYPES(cls):
         }
 
     RETURN_TYPES = ("ACCUMULATION",)
-    INPUT_IS_LIST = (True,)
+    INPUT_IS_LIST = True
 
     FUNCTION = "list_to_accumulation"