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Beta of kairos for redis, significantly refactors the API. All types of
timeseries are created with the Timeseries constructor. The arguments to
the constructor have been changed to simplify and clarify their usage. In
particular, a single timeseries implements only a single type (e.g. Histogram)
read and write functions are shared by all intervals in a timeseries, and the
count_only support is now the timeseries type `count`. See README for details.
Added exceptions. Only exception currently implemented is UnknownInterval.