Bonsai_proc.VarSourceA Var.t is the primary method for making data obtained outside of Bonsai (maybe via an RPC) accessible inside a Bonsai application.
Updates the value inside of t. f is given the previous value of t so that you can reuse parts of the value if applicable
Provides read-only access to t by producing a Value.t which is used inside of a Bonsai computation.
Retrieves the underlying 'a t Ui_incr.t var.