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static void _kvad_node_release(kvad_node* node) {
    if (node->subnodes[0]) {
        // Non-leaf node: first free subnodes..
        for (size_t i=0;i<4;i++) {
            _kvad_node_release(node->subnodes[i]);
            free(node->subnodes[i]);
        }
    } else {
        // Leaf node: free data..
        kvad_data *data = node->data;
        while (data) {
            kvad_data *curr = data;
            data = data->next;
            free(curr);
        }
    }
    //..then free this node
    free(node);
}