Method awaited_by_discard

crates/stdlib/src/_asyncio.rs:748–765

Discard waiter from fut_awaited_by with single-object optimization

(&self, waiter: &PyObject, vm: &VirtualMachine)

        /// Discard waiter from fut_awaited_by with single-object optimization
        fn awaited_by_discard(&self, waiter: &PyObject, vm: &VirtualMachine) -> PyResult<()> {
            let mut awaited_by = self.fut_awaited_by.write();
            if awaited_by.is_none() {
                return Ok(());
            }

            let obj = awaited_by.as_ref().unwrap();
            if !self.fut_awaited_by_is_set.load(Ordering::Relaxed) {
                // Single object - check if it matches
                if obj.is(waiter) {
                    *awaited_by = None;
                }
            } else {
                // It's a Set - use discard
                vm.call_method(obj, "discard", (waiter.to_owned(),))?;
            }
            Ok(())
        }

        #[pymethod]
        fn __await__(zelf: PyRef<Self>, _vm: &VirtualMachine) -> PyResult<PyFutureIter> {