Serhiy Storchaka added the comment:
Sets often are used in following pattern:
def recurse(obj):
if subobj not in proceeding:
proceeding.add(obj)
for subobj in links(obj):
recurse(subobj)
proceeding.discard(obj)
In this case items are added and removed in LIFO order. How this change affects
this case?
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<http://bugs.python.org/issue29476>
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