Setting breakpoints

If I want to set a breakpoint on a given line of code in a file, I have to
find the jsdIScript object which matches that line of code in a file and set
the breakpoint there.  Problem is, it's not a 1-1 mapping. When you have
closures, you'll get overlapping jsdIScript objects.  How do you know which
one to set the breakpoint on?  I guess you just have to determine which one
is the inner-most object, or the smallest subset?

I found this API interaction confusing (as well as different from setting
breakpoints most debugging APIs) but I'm not sure I can make a convincing
argument for why this logic should be buried in the JSD.  From just looking
at the API, it's not obvious how to set a breakpoint.  That's probably not a
good reason.

Thanks,
Adam