[issue44562] types.GenericAlias should decref instead of using delete in tp_new

[Pablo Galindo Salgado]

Pablo Galindo Salgado <pablogsal at gmail.com> added the comment:

> But is alias->origin initialized to safely call Py_XDECREF(alias->origin)?

Why would that be unsafe? PyType_GenericAlloc sets all fields to NULL so that is going to either be NULL or have an object, no? setup_ga only sets alias->origin if there has been no failures

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