mcve-google-cloud-firestore-4.9.9

@google-cloud/firestore v4.9.9 introduces an bug in which queries that do equality comparissons against timestamps fail.

1. clone the repo
2. cd into the root and run npm install
3. create a test firebase project and firestore database and copy serviceAccountKey.json to the root of the cloned repo
4. npm run test
5. The test passes
6. npm i @google-cloud/firestore@4.9.9
7. npm run test
8. The test fails

It is possible to alternate back and forth between v4.9.8 and v4.9.9 using npm i ... as many times as wanted and consistently fail on 4.9.9 but pass on 4.9.8