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The following patch introduces a new interop interface implementation with the following characteristics: * It supports the new 6.0 prefer_type specification * It supports both explicit objects (from interop constructs) and implicit objects (from variant calls). * Implements a per-thread reuse mechanism for implicit objects to reduce overheads. * It provides a plugin interface that allows selecting the supported interop types, and managing all the backend related interop operations (init, sync, ...). * It enables cooperation with the OpenMP runtime to allow progress on OpenMP synchronizations. * It cleanups some vendor/fr_id mismatchs from the current query routines. * It supports extension to define interop callbacks for library cleanup.