Using MongooseMap causes memory leak on model.schema.subpaths

[mistyByme]

Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the bug has not already been reported

Mongoose version

7.5.0

Node.js version

18.16.0

MongoDB server version

5.0

Typescript version (if applicable)

4.9.4

Description

model fields for model.schema.subpaths will collect the paht of map childSchema ,it will make the memory bigger and bigger if path changed.

Steps to Reproduce

import mongoose from 'mongoose';

mongoose.connect('mongodb://localhost:27017', { dbName: 'test' });
const tradeSchema = new mongoose.Schema({ tradeId: Number, content: String });

const testSchema = new mongoose.Schema(
    {
        userId: Number,
        tradeMap: {
            type: Map,
            of: tradeSchema,
        },
    },
);

const TestModel = mongoose.model('Test', testSchema);

main();

async function test() {
    const userId = 100;
    const user = await TestModel.create({ userId, tradeMap: new Map() });

    //add subDoc
    for (let id = 1; id <= 10; id++) {
        const trade = { tradeId: id, content: 'test' };
        user.tradeMap.set(trade.tradeId.toString(), trade);
    }
    await user.save();
    await TestModel.deleteOne({ userId });
}

async function main() {
    await test();
    //print TestModel.schema.subpaths
    console.log((TestModel.schema as any).subpaths);
}
    /* output
    {
  'tradeMap.1._id': undefined,
  'tradeMap.2._id': undefined,
  'tradeMap.3._id': undefined,
  'tradeMap.4._id': undefined,
  'tradeMap.5._id': undefined,
  'tradeMap.6._id': undefined,
  'tradeMap.7._id': undefined,
  'tradeMap.8._id': undefined,
  'tradeMap.9._id': undefined,
  'tradeMap.10._id': undefined,
  'tradeMap.1.tradeId': undefined,
  'tradeMap.1.content': undefined,
  'tradeMap.2.tradeId': undefined,
  'tradeMap.2.content': undefined,
  'tradeMap.3.tradeId': undefined,
  'tradeMap.3.content': undefined,
  'tradeMap.6.content': undefined,
  'tradeMap.7.tradeId': undefined,
  'tradeMap.7.content': undefined,
  'tradeMap.8.tradeId': undefined,
  'tradeMap.8.content': undefined,
  'tradeMap.9.tradeId': undefined,
  'tradeMap.9.content': undefined,
  'tradeMap.10.tradeId': undefined,
  'tradeMap.10.content': undefined
    }
     */

Expected Behavior

if the key of tradeMap is string for number type (user.tradeMap.key also equal to trade.id.toString()), it will made TestModel .schema.subpaths cache the child path (for exanmple ''tradeMap.6.content“、’tradeMap.8.tradeId” etc'). if trade.id keeps increasing, the memory of global variable TestModel will be increasing too.

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