This removes the exclusive from the res names and edge names. We now
require that the names should be lists of strings, however they can
still be single strings if that can be determined statically.
Programmers should explicitly wrap their variables in a string by
interpolation to force this, or in square brackets to force a list. The
former is generally preferable because it generates a small function
graph since it doesn't need to build a list.
We are planning to implement an optimization in which some function
calls are compiled to a single static graph rather than to a CallFunc
which dynamically creates a sub-graph at runtime. These test cases
exercise corner cases for which it would be theoretically possible to
use a static graph, but which we might not be able to optimize.
