Method keys

crates/stdlib/src/contextvars.rs:218–221

(zelf: &Py<Self>)

        // TODO: wrong return type
        #[pymethod]
        fn keys(zelf: &Py<Self>) -> Vec<PyObjectRef> {
            let vars = zelf.borrow_vars();
            vars.keys().map(|key| key.to_owned().into()).collect()
        }

        // TODO: wrong return type
        #[pymethod]