pypy / pypy / interpreter / typedef.py

Diff from to

pypy/interpreter/typedef.py

 # typical usage (case 1 is the most common kind of app-level subclasses;
 # case 2 is the memory-saving kind defined with __slots__).
 #
+#  +----------------------------------------------------------------+
+#  | NOTE: if withmapdict is enabled, the following doesn't apply!  |
+#  | Map dicts can flexibly allow any slots/__dict__/__weakref__ to |
+#  | show up only when needed.  In particular there is no way with  |
+#  | mapdict to prevent some objects from being weakrefable.        |
+#  +----------------------------------------------------------------+
+#
 #     dict   slots   del   weakrefable
 #
 # 1.    Y      N      N         Y          UserDictWeakref
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