Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:

An analogy may help.  Release managers must check the list of release blockers 
and stop if the list is non-empty.  If no release blockers were ever filed, the 
release blockers list is empty, but it still exists and its definition hasn't 
changed.

The test is_blocked(blockers) tells us whether the list is non-empty.  It 
doesn't redefine what it means to be a blockers list.

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<https://bugs.python.org/issue46814>
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