[kstenerud]

Ion almost got it right. The problems are:

- Binary format is big endian. All modern processors use little endian.

- The time format doesn't have a time zone.

- The binary time format is in UTC, while the text format is in local time, and you have to convert (WTF!)

- The binary time format is HUGE.

- Typed nulls seems a little excessive for very little gain.

- No efficient small integer encoding.

- Containers in the binary format are prepended by the element count, which makes progressive container filling impossible.

- No custom types (except maybe s-exps, which are overkill)

- No metadata

- No URI, UUID types

- no markup container

- no references