Simplify minimal SSZ again

test_libs/pyspec/eth2spec/utils/minimal_ssz.py

@@ -9,12 +9,8 @@ ZERO_CHUNK = b'\x00' * BYTES_PER_CHUNK
 cached_typedefs = {}
 
 
-def SSZType(name, fields):
+def SSZType(fields):
     class SSZObject():
-        if name is not None:
-            __name__ = name
-            __qualname__ = name
-
         def __init__(self, **kwargs):
             for f, t in fields.items():
                 if f not in kwargs:
@@ -31,12 +27,9 @@ def SSZType(name, fields):
         def __str__(self):
             output = []
             for field in self.fields:
-                output.append(f'{field}: {repr(getattr(self, field))},')
+                output.append(f'{field}: {getattr(self, field)}')
             return "\n".join(output)
 
-        def __repr__(self):
-            return name + "(**{\n    " + str(self).replace("\n", "\n    ") + "\n})"
-
         def serialize(self):
             return serialize_value(self, self.__class__)
 
@@ -44,19 +37,9 @@ def SSZType(name, fields):
             return hash_tree_root(self, self.__class__)
 
     SSZObject.fields = fields
-
-    if name is not None:
-        cached_typedefs[name] = SSZObject
-
     return SSZObject
 
 
-def SSZTypeExtension(original_type, new_fields):
-    typedef = cached_typedefs[original_type]
-    typedef.fields.update(new_fields)
-    return typedef
-
-
 class Vector():
     def __init__(self, items):
         self.items = items
@@ -334,7 +317,7 @@ def truncate(container):
         key: container.fields[key]
         for key in field_keys[:-1]
     }
-    truncated_class = SSZType(None, truncated_fields)
+    truncated_class = SSZType(truncated_fields)
     kwargs = {
         field: getattr(container, field)
         for field in field_keys[:-1]