BoxedExpression.match() with a Rational incorrectly returns null when the second argument is a number.

[rjantoine]

Description

BoxedExpression.match() incorrectly returns null for a Rational when the second argument is anything other than a variable.

Steps to Reproduce

// Incorrect results
const brokenOne = ce.box(["Rational", 3,2]).match(ce.box(["Rational", "_num", "_den"])) // Incorrectly returns null
const brokenTwo = ce.box(["Rational", "x",2]).match(ce.box(["Rational", "_num", "_den"])) // Incorrectly returns null
const brokenThree = ce.box(["Rational", "x",["Power", 3, 2]]).match(ce.box(["Rational", "_num", "_den"])) // Incorrectly returns null

// Similar, correct results
const worksOne = ce.box(["Rational", 3,"y"]).match(ce.box(["Rational", "_num", "_den"])) // Correctly returns {_num: 3, _den: "y"} when converted to JSON
const worksTwo = ce.box(["Rational", "x","y"]).match(ce.box(["Rational", "_num", "_den"])) // Correctly returns {_num: "x", _den: "y"} when converted to JSON

console.log({brokenOne, brokenTwo, worksOne, worksTwo})

Actual Result

{
  brokenOne: null,
  brokenTwo: null,
  brokenThree: null,
  worksOne: {
    _num: qe {
      engine: [n],
      verbatimLatex: undefined,
      _value: [n],
      _hash: undefined
    },
    _den: Gt {
      engine: [n],
      verbatimLatex: undefined,
      _hash: undefined,
      _id: 'y',
      _def: [Object]
    }
  },
  worksTwo: {
    _num: Gt {
      engine: [n],
      verbatimLatex: undefined,
      _hash: undefined,
      _id: 'x',
      _def: [Object]
    },
    _den: Gt {
      engine: [n],
      verbatimLatex: undefined,
      _hash: undefined,
      _id: 'y',
      _def: [Object]
    }
  }
}

Expected Result

// when converted to JSON
{
    brokenOne: {_num: 3, _den: 2}, // instead of null
    brokenTwo: {_num: "x", _den: 2}, // instead of null
    brokenThree: {_num: "x", _den: ["Power",3,2]}, //instead of null
    worksOne: {_num: 3, _den: "y"}, // this is already correct
    worksTwo: {_num: "x", _den: "y"} // this is also already correct
}

Environment

• Node using "@cortex-js/compute-engine": "^0.30.2"
• Also occurs using the demo boxes on the website