Surely this is what he meant. Since edge peering/CDN is fundamentally caching (last I checked). It can't be off-by-one, and there are only 2 hard problems in CS, so there you have it.

"There are only two hard problems in CS : 1. Naming things. 2. Cache invalidation. "

"There are only two hard problems in CS : 1. Naming things. 2. Cache invalidation. 3. Off-by-one errors"

Only you got the order wrong. One of those distributed systems problems.

I thought he meant IE support.

He means naming things

I'm pretty sure a lack of coffee is the real issue at hand. Google made more architecture to give peers an edge via two different Espresso shots to test