Method intersection

crates/vm/src/builtins/set.rs:255–264

(&self, other: ArgIterable, vm: &VirtualMachine)

    }

    pub(super) fn intersection(&self, other: ArgIterable, vm: &VirtualMachine) -> PyResult<Self> {
        let set = Self::default();
        for item in other.iter(vm)? {
            let obj = item?;
            if self.contains(&obj, vm)? {
                set.add(obj, vm)?;
            }
        }
        Ok(set)
    }

    pub(super) fn difference(&self, other: ArgIterable, vm: &VirtualMachine) -> PyResult<Self> {
        let set = self.copy();