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Hmm, not sure why you need to much with __builtins__.
Can't you 
create a class of exceptions and just have the
detectors include then 
using the standard import
mechanism?

Hmm, now that I 
think of it, the detectors are pretty isolated
from the standard 
variables. So if I can't get to the global
variables, I can't get to the global 
exceptions.

I think its useful to have a standard set of exceptions 
to
raise for consistancy between the reactors. I am thinking of
(at 
minimum):

    PermissionError - user tried to do something that 
s/he
          didn't have permission to do.

    ValueError - user provided 
bogus data in some way

    Reject - Other rules are in place (besides 
permissions)
          to prevent the user from doing what they 
requested.

-- rouilj