Trie docs up to date?

With the work going on lately for tabling I wonder if the tries API documentation is up to date?

It says the tries API is not stable, for example.

I do not foresee significant changes to the API. The recent tabling developments added some internal $-APIs. There might be significant changes to the implementation. Some comparison with XSB shows that insert and memory usage are similar, but trie_gen/3 in XSB is about 10 times faster. In part that is because their tries are far deeper integrated into the VM.