_prop_rb_tree_find
opdk = _prop_rb_tree_find(&_prop_dict_keysym_tree, key);
opdk = _prop_rb_tree_find(&_prop_dict_keysym_tree, key);
opn = _prop_rb_tree_find(&_prop_number_tree, pnv);
opn = _prop_rb_tree_find(&_prop_number_tree, pnv);
_prop_rb_tree_find(struct rb_tree *, const void *);