Method cmp

crates/stdlib/src/array.rs:1198–1246

(
            zelf: &Py<Self>,
            other: &PyObject,
            op: PyComparisonOp,
            vm: &VirtualMachine,
        )

    impl Comparable for PyArray {
        fn cmp(
            zelf: &Py<Self>,
            other: &PyObject,
            op: PyComparisonOp,
            vm: &VirtualMachine,
        ) -> PyResult<PyComparisonValue> {
            // TODO: deduplicate this logic with sequence::cmp in sequence.rs. Maybe make it generic?

            // we cannot use zelf.is(other) for shortcut because if we contenting a
            // float value NaN we always return False even they are the same object.
            let other = class_or_notimplemented!(Self, other);

            if let PyComparisonValue::Implemented(x) =
                op.eq_only(|| Ok(zelf.array_eq(other, vm)?.into()))?
            {
                return Ok(x.into());
            }

            let array_a = zelf.read();
            let array_b = other.read();

            let res = match array_a.cmp(&array_b) {
                // fast path for same ArrayContentType type
                Ok(partial_ord) => partial_ord.is_some_and(|ord| op.eval_ord(ord)),
                Err(()) => {
                    let iter = Iterator::zip(array_a.iter(vm), array_b.iter(vm));

                    for (a, b) in iter {
                        let ret = match op {
                            PyComparisonOp::Lt | PyComparisonOp::Le => {
                                vm.bool_seq_lt(&*a?, &*b?)?
                            }
                            PyComparisonOp::Gt | PyComparisonOp::Ge => {
                                vm.bool_seq_gt(&*a?, &*b?)?
                            }
                            _ => unreachable!(),
                        };
                        if let Some(v) = ret {
                            return Ok(PyComparisonValue::Implemented(v));
                        }
                    }

                    // fallback:
                    op.eval_ord(array_a.len().cmp(&array_b.len()))
                }
            };

            Ok(res.into())
        }
    }

    impl AsBuffer for PyArray {