Remote Playground: Assignment not working

[MarcusDenker]

With the changes we did, reading the nil from a binding seems to work

• a SeamlessRemoteWorkspaceVariable is created and added as a binding to the playground
• printing a variable returns "nil"

But assignments do not work yet:

• we get a "SeamlessRemoteException: UnhandledErrror"

Interestingly the number of SeamlessRemoteWorkspaceVariable instances grows with each attempt, even though the sole
place where instances are created executes just once.