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>> However, there is a problem with nulls inside JSON data. The
>> json.decode() inserts json.util.null() there, but, to get serializable
>> output, I need Lua nils.

>> I don't want to recursively traverse loaded data and replace nulls with nils.

>> Is luajson author here? Can something be done? I suggest adding
>> optional flag to json.decode().

> if it would decode to `nil` you wouldn't be able to know about the
> existance of that field at all, you need this json.util.null to
> distinguish null data from no data

In my use case I do not need to make this distinction.