Decca is an implementation of Deku in <200 lines using virtual-dom. The full Deku v2 API is implemented (plus a little more)—you can use Decca while Deku v2.0.0 is in development.
path (see Components) in Deku is a dot-separated path of the component relative to its ancestors (eg, aw398.0.0). In Decca, path is simply a unique ID for the component instance (eg, c83). It fulfills the same function as a unique identifier.