jshn.sh: Adding array twice gives counterintuitive result

[pony1k]

The following

#!/bin/sh

. /usr/share/libubox/jshn.sh

json_init

json_add_array array
	json_add_string "" "item1"
	json_add_string "" "item2"
	json_add_string "" "item3"
json_close_array

json_add_array array
	json_add_string "" "itemA"
	json_add_string "" "itemB"
	json_add_string "" "itemC"
json_close_array

json_dump

outputs

{ "array": [ "itemA" ] }

which is surprising. I've expected it to output

{ "array": [ "itemA", "itemB", "itemC" ] }