According to Google 999999999999999 – 999999999999998 = 0

This actually is quite surprising. If you play around, you quickly discover the epsilon does not correspond to any standard mantissa sizes.

In fact, Google appear to represent numbers to a precision of 1 part in 333333333333333:

https://www.google.co.uk/search?q=333333333333334+-+33333333... and all smaller positive successive integer pairs yield 1

https://www.google.co.uk/search?q=333333333333335+-+33333333... and all larger positive successive integer pairs yield 0

what the hell kind of numeric representation does that?