Method copy

crates/stdlib/src/contextvars.rs:171–183

(&self, vm: &VirtualMachine)

        #[pymethod]
        fn copy(&self, vm: &VirtualMachine) -> Self {
            // Deep copy the vars - clone the underlying Hamt data, not just the PyRef
            let vars_copy = HamtObject {
                hamt: RefCell::new(self.inner.vars.hamt.borrow().clone()),
            };
            Self {
                inner: ContextInner {
                    idx: Cell::new(usize::MAX),
                    vars: vars_copy.into_ref(&vm.ctx),
                    entered: Cell::new(false),
                },
            }
        }

        fn __getitem__(
            &self,