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a96b05e63f
There are 2 issues: 1. When a MULTISORT_ABORT happens, it frees func, but func may point to ARRAYG(multisort_func), which would be a problem with nested invocations as it can destroy that of the "parent" invocation. To solve this, delay assigning to the globals. 2. The old globals were not restored which means that nested invocations with different flags will cause a wrong sorting function to be used. Closes GH-19319.