k5_json_bool_create
int k5_json_bool_create(int truth, k5_json_bool *val_out);
ret = k5_json_bool_create(in, &b);
ret = k5_json_bool_create(1, &bval);
ret = k5_json_bool_create(0, &bval);
if (k5_json_bool_create(truth, &b))