Revert "hmset throws/errors out on non-string values. fixes#218"
Reverting because this was a documentation problem, not a problem with
the code. Performance-wise, this is faster than the approach in #345, though
it may cause users more trouble. This is okay, if someone opens an issue we
can point them to the docs.
This reverts commit b60e001.
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Feb 24, 2013