Continuum: URIs are not unique

[ybakos]

When storing new information via Rhizome#store, the Rhizome delegates to Continuum#store. The Continuum creates a Uri using the default constructor, Uri(). Because == between two Uri objects is based on the hashCode of the toString representation of a Uri, just using distinct default Uri objects does not create unique Uris for each newly-created Thing.

This results in the Continuum's hashtable to overwrite the Thing value associated with the Uri key. It also probably fucks up the index in the Repertory.

Soooo... time to focus on Uris for each Thing in the system, to ensure that they are, somehow, unique.

void main() {
  final u1 = Uri();
  final u2 = Uri();
  print(u1 == u2); // true
}