api: fix Map key processing

neo3/api/helpers/unwrap.py

@@ -147,6 +147,13 @@ def as_dict(res: noderpc.ExecutionResult, idx: int = 0) -> dict:
     Raises:
         ValueError: if the index is out of range, or the value cannot be converted to a dict.
 
+
+    Warning:
+        Accepted key types on the Virtual Machine side are `int`, `str` and `bytes`.
+        However, when data is returned there is no way to differentiate between
+        the key being of type `str` or `bytes` as the RPC node will encode both as a `ByteString`.
+        The dictionary returned will return such types as `bytes` and it is the user responsibility to decode
+        them to a `str` if needed.
     """
     return item(res, idx).as_dict()
 

neo3/api/noderpc.py

@@ -522,11 +522,6 @@ def _parse_stack_item(item: _Item) -> StackItem:
             map_ = []
             for stack_item in item["value"]:
                 key = ExecutionResult._parse_stack_item(stack_item["key"])
-                key_type = StackItemType(stack_item["key"]["type"])
-                if key_type == StackItemType.BYTE_STRING:
-                    key.value = key.value.decode()
-                else:
-                    key.value = str(key.value)
                 value = ExecutionResult._parse_stack_item(stack_item["value"])
                 map_.append((key, value))
             return MapStackItem(type_, map_)