Apparently it's not working - those lines are in my code, but here's the debug output I created which parses the iterable returned by get_author_tokens and then builds the query string:
author token is: J
author token is: R
author token is: R
author token is: Tolkien
final author query string is J+R+R+Tolkien
I haven't done any debugging of the function itself, was just getting it hooked into the plugin thus far.
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