If I import 'foo, I'd like for the 'foo in my namespace and the 'foo in the library's namespace are both aliases for the same variable.
I like that.
leak!it
yes, there will need to be some mechanism to say that when my macro expands into a "bar", do I mean my bar or your bar? (Scheme's hygienic macros cleverly chooses which one you want most of the time, but makes it far too awkward to override the choice when it gets it wrong).
namespaces [...] don't really fix anything if they're human-guessable prefixes
