FlagGrouper: Encapsulate instead of subclassing UniqueGrouper #569
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This avoids hitting this check: https://github.com/pydata/xarray/blob/aa9e2bd407a47cef1ec7f1d9498e4a1118bc440e/xarray/core/groupby.py#L329-L337 and generally seems like a better design