RExpression output ports search entire search path for objects to export
This is debatable, but currently the RExpression actor will search the entire search path for an object to export to an output port. For example, if I create an output port "data", but do not assign it a value, the RExpression actor will export the function data from the utils package. An alternative would be to limit exports to variables in the global environment (.GlobalEnv). That would basically mean changing the export commands (file, serialize, close) in an if(exists("data", .GlobalEnv, inherits = FALSE)) statement.