I have mixed feelings. I don't think this is very useful right now. The
weak hash gives us less information than the full context, and we
currently lack a mechanism to retrieve a context from a weak hash,
althought we may have one in the future.
On the other hand the implementation of this feature is harmless.
So, I'm accepting it, I must say, mostly because it has already been
screened. Maybe next time, please share the reasons *why* adding some
feature is a good idea :)
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