Duplicate binaries

The following piece of code currently causes a binary to be stored (or at least read) twice:

InputStream stream = ...;
Session session = ...;
Value value = sesion.getValueFactory().createValue(stream);
session.getRootNode().setProperty("data", value);
node.save();

The reason is the ValueBasedBlob class that prevents the underlying storage to see that the Blob being saved was already stored earlier and thus no extra copy is needed.