[Pika-dev] Hashtrees a bit unflexible

[Andreas Rottmann]

I just noted that hackerlabs hashtrees are a bit unflexible compared
to the GLib ones: You cannot pass an additional pointer to e.g. the
hashtree_free_data_fn. I would however need this functionality to be
able to keep the storage in a memchunk for efficient (esp. space-wise)
allocation. 

A hack to do so would involve using a special "rules" structure that
has an additional field. Is this the way it's ment to work, or should
hashtree functions be extended to take an additional void * argument?
If the argument would be last, this change wouldn't break ABI wrt
existing usage, I think. Tom?

Cheers, Andy
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