Documented gc.get_referrers() as dangerous.
SF bug 793822
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@ -96,6 +96,11 @@ be listed among the resulting referrers. To get only currently live
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objects, call \function{collect()} before calling
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\function{get_referrers()}.
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Care must be taken when using objects returned by
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\function{get_referrers()} because some of them could still be under
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construction and hence in a temporarily invalid state. Avoid using
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\function{get_referrers()} for any purpose other than debugging.
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\versionadded{2.2}
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\end{funcdesc}
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