Reproduce: Mongoose slice followed by any operation that calls `cast` during the following operation results in an error

test.js

const Mongoose = require('mongoose');

const { Schema } = Mongoose;

const xSchema = new Schema({
  a: [String],
});

const X = Mongoose.model('X', xSchema);

const x = new X({
  a: ['c'],
});
// x.a[Symbol(mongoose#Array#_schema)] is an object with caster property
// fine
x.a.unshift('b');
const a = x.a.slice();
// a[Symbol(mongoose#Array#_schema)] is undefined
// not fine
a.unshift('a');