Tim Graham 01987bc0b4 [2.0.x] Fixed #28737 -- Clarified {% cache %} tag's handling of arguments.
Thanks Tom Aratyn for the report.

Backport of 171c7cc863eafc2346aa84ffd1d540644539f1a4 from master
2017-10-25 14:21:27 -04:00
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