JSON Patch

Since JSON is a subset of JS, I would have expected `.` to be the delimiter. That jives with how people think of JSON structures in code. (Python does require bracket syntax for traversing JSON, but even pandas uses dots when you generate a dataframe from JSON.)

When I see `/`, I think:

- "This spec must have been written by backend people," and

- "I wonder if there's some relative/absolute path ambiguity they're trying to solve by making all the paths URLs."

I actually think an array would be better, ["foo","bar"] for "foo.bar". How many many bugs are introduced by people not escaping properly? It's more verbose, but judging by the rest of the standard, they don't seem to be emphasizing brevity.