[plt-scheme] Debugging library code

Is there a way to debug library code sanely?  I tried doing it in DrScheme
(which I don't generally use) but found that opening files from the collects
directory under the install and setting breakpoints in them doesn't work: it
seems DrScheme won't hit breakpoints in a .ss file if it's actually reading
from a compiled library file.  How can I do this?

Thanks,
~NT
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