Antoine Pitrou <[email protected]> added the comment:
I think the "premature" optimization comes down to that code:
"""
static int
put(Picklerobject *self, PyObject *ob)
{
if (Py_REFCNT(ob) < 2 || self->fast)
return 0;
return put2(self, ob);
}
"""
(put2() being the function which emits BINPUT)
When you unpickle a dict, its contents are created anew and therefore the
refcount is 1 => next pickling avoids emitting a BINPUT.
----------
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<http://bugs.python.org/issue13735>
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