[PATCH] Add-native-hashtable-helper-functions

[Nala Ginrut]

Added three helper functions, they're so explicit that don't need any
docs in the manual I think. Docstring is enough.

* hash-items: get the amount of items in the hash table
* hash-size: return the size of hash table
* hash-keys: return all the keys of hash table as a list

Thanks!

0001-Add-native-hashtable-helper-functions.patch
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