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The TreeSink API is generic over a Handle to a node. In the C API this should be a wrapper around void *, which calls optional incref and decref callbacks on Clone and Drop respectively.
See hubbub's tree builder API as well.
Maybe expose the existing GC trace hooks to C code, as well? It's potentially useful for writing bindings to a GC'd language.
We removed the C API in #204 since it had been broken for a long time and no-one was maintaining it. If something related is to be added again, I’d rather see it evolve for a while outside this repository.