Atoms: integers, floats, strings

For object content, RON defines four basic data types.

When unambiguous, prefixes could be omitted: 1099 3.14 D4ICC+XU5eRJ.

If UUID happen to serialize to a string that could also be interpreted as a number (e.g. 0/1230000000$0000000000 = 123), it MUST be prefixed: >123.

Operations.