Firestore increment floating points issue

Question

Note that I know there have been some other questions, but no real answer, on SO, regarding this issue.

So, what has been happening since the increment field value was i

Answer 1

According to the documentation, Cloud Firestore stores floating point numbers in IEEE 754 format. Please take some time to understand what this format implies. Basically, you can't count on floating point number to retain exactly the accuracy that you've specified, as the format can't possibly do that for some numbers. You can expect some small variation when the number is stored. A good summary of this type of behavior can already be found here on Stack Overflow:

• Why are floating point numbers inaccurate?

If you must retain numerical accuracy, look into using a library that will help load and store numbers that have the accuracy you need. Pretty much all financial application will do something like this, as IEEE 754 can effectively lose data in order to compress the data down to a small size.