[Python-Dev] Tagged integers

[Jeff Epler]

One more random Tagged Types thought.

If we were introducing the test & branch for tagged types in incref/decref
anyway (unlikely, I know) wouldn't this let us add another oft-suggested
optimization at the same price: for certain immortal objects (None, (),
'', etc) there's no need to actually change the refcount.  Make these
objects Tagged, and those memory accesses go away in favor of a single
register test that already exists to provide tagged integers.

Jeff
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