This issue is about an inconsistency between the firestore JS SDK and the nodejs SDK. Firestore JS SDK stores negative zero (-0) has a double value with the correct sign. The NodeJS SDK does not do so. This leads to loss of data (the number's sign) as well as some odd behavior when trying to query documents saved from the JS SDK based on -0.

Environment details

• OS: macOS
• Node.js version: 16.13
• npm version: 8.1
• @google-cloud/firestore version: 4.15.1

Steps to reproduce

1. write negative zero to a document

await firestore.collection('test').doc('test').set({ number: -0 })

2. read the document and ensure the value is negative zero

const doc = await firestore.collection('test').doc('test').get();
const expectedToBeNegativeZero = doc.data().number;
console.assert(Object.is(expectedToBeNegativeZero, -0))

Firebase Web SDK: ✅ Works as expected
Firebase Node.JS SDK: ❌ Value is 0 instead of -0