Provides reference types that refer to clojure data potentially off-heap or remotely.

e.g
 (let [dref (dref/persist "file:///Users/foobar/objects" 42 {:as "edn"})]
   @dref ;; derefable
   (dref/reference (uri dref)) ;; reobtain the reference from a URI
   (dref/value (uri dref)) ;; alternative deref operator, takes a URI (and additional options)
  )

Reference identity is a URI, the scheme of which determines the type.
e.g
volatile: mutable, non-cached
value: immutable, cached & interned while references exist.

The subscheme determines the storage implementation
e.g
file: File system storage
mem: Transient memory storage

Further storages can be found in the `scheme` package.
Extend to new schemes via the multimethods `read-bytes` `write-bytes!` and `delete-bytes!.

The file extension of the uri determines the storage format.
e.g
edn
edn.zip

Further formats can be found inthe `format` package.
Extend to new formats via the multimethods `serialize` and `deserialize`.

You can deref via `value` a URI, (or string uri), or a reference object obtained with `reference`.

Example URI's:
`volatile:mem://foo/bar/baz.edn`
`value:file:///Users/foobar/objects/f79975f99908e5387fca3b503d9e9adbefaafc5e.edn.zip`