[Python-Dev] Alternative implementation of interning

[Skip Montanaro]

A couple minor nits from scanning the patch:

* Probably makes no difference, but it seems oddly asymmetric to fiddle with
  the interned string's refcount in string_dealloc, call PyObject_DelItem,
  then not restore the refcount to zero.

* Should be Py_DECREF(keys) (not Py_XDECREF(keys)) in
  _Py_ReleaseInternedStrings.  If you've gotten that far keys can't be
  NULL.  If you're worried about keys being NULL, you should check it before
  the for loop (PyMapping_Size() will barf on a NULL arg).

Also, regarding the name of PyString_InternInPlace, I see now that's the
original name.  I suggest that name be deprecated in favor of
PyString_InternImmortal with a macro defined in stringobject.h for
compatibility.

Skip