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But it would be very difficult to fix the code base to avoid
the problem. The 'tuple' constructor was only an example; it
is actually a quite common pattern everywhere in the C code
base of both the core and extension modules. Expecting an
object not to be seen before you first hand it out is
extremely common, and get_referrers() breaks that
assumption. Hence the claim that the problem really lies in
get_referrers().