- Try harder to mark integers as KORE_JSON_TYPE_INTEGER, especially if
they fit in the internal representation of one (int64_t).
- Move error codes into the JSON code itself, rather then requiring
a kore_json data structure. This allows the JSON API to relay errors
such as "item not found" or "type mismatch" properly when looking at items.
- When asking for a KORE_JSON_TYPE_INTEGER_U64 and a KORE_JSON_TYPE_INTEGER
was found with the same name, check if it could be returned properly and do
so if possible.
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