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Patch attached. Terry, you'll notice I wrap the main part of the urlencode function in a big try/except block to catch TypeErrors & ValueErrors.
I'm a bit concerned that doing this may misreport the true underlying error in the event we screw up values/types in a way that doesn't relate to the 'query' argument, but I think the code seems to do a pretty good job of ensuring that won't happen -- so that fear may be unfounded.
You'll see I reworked the documentation quite a bit. The wording was a bit odd in places, and I called out a few things that may not be obvious at a glance. Hopefully it seems like an improvement. :)