/*
* call-seq: to_json(state = nil, depth = 0)
*
* Returns a JSON string containing a JSON array, that is unparsed from
* this Array instance.
* _state_ is a JSON::State object, that can also be used to configure the
* produced JSON string output further.
* _depth_ is used to find out nesting depth, to indent accordingly.
*/
static VALUE mArray_to_json(int argc, VALUE *argv, VALUE self) {