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This module lets you defer actions at run-time that will take place when the
control flow returns into an upper scope. Currently, you can:
* hook an upper scope end with "reap"
* localize variables, array/hash values or deletions of elements in
higher contexts with respectively "localize", "localize_elem" and
"localize_delete"
* return values immediately to an upper level with "unwind", and know
which context was in use then with "want_at"
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