On error, the function should return -1 to stop the encoding
process. On success, it should return 0.
+ .. versionadded:: 2.2
+
.. function:: int json_dump_callback(const json_t *json, json_dump_callback_t callback, void *data, size_t flags)
Call *callback* repeatedly, passing a chunk of the JSON
representation of *root* each time. *flags* is described above.
Returns 0 on success and -1 on error.
+ .. versionadded:: 2.2
+
.. _apiref-decoding: