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I think it would be possible to have two versions of

\_PyGC\_REFS\_UNTRACKED, one being, say, -5.
\_PyGC\_REFS\_UNTRACKED\_AND\_KEEP\_IT\_THAT\_WAY would be what you get
when you call PyObject\_GC\_UnTrack; the code to do automatic
tracking/untracking based on contents would use some other
new API (which would be non-public in 2.7.x).