Comment 2 for bug 1928474

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Colin Watson (cjwatson) wrote : Re: sudden flurry of PreconditionFailed errors from unchanged processing

In fact it's because the list of tags on a bug is serialized for ETag purposes as `[u'foo', u'bar', u'baz']` on Python 2, but as `['foo', 'bar', 'baz']` on Python 3.