*  * http://host
 *
 * Both the unnecessary port specification (`:80`) and the absent trailing slash (`/`) cause URI to
 * bucket the two URLs separately. This harms URI's usefulness in collections. Any application that
 * stores information-per-URL will need to either canonicalize manually, or suffer unnecessary
 * redundancy for such URLs.
 *
 * Because they don't attempt canonical form, these classes are surprisingly difficult to use

// marshaling to YAML and JSON. In particular, it marshals into strings, which
// can be used as map keys in json.
message Duration {
  optional int64 duration = 1;
}

// FieldsV1 stores a set of fields in a data structure like a Trie, in JSON format.
//
// Each key is either a '.' representing the field itself, and will always map to an empty set,