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https://github.com/pandas-dev/pandas/blob/master/pandas/core/groupby/groupby.py#L1294
# To track operations that expand dimensions, like ohlc
OutputFrameOrSeries = TypeVar("OutputFrameOrSeries", bound=NDFrame)
at the very least this should be in pandas._typing
. puzzled why we need this at all, as this is the same as FrameOrSeries
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type annotations, mypy/pyright type checkingtype annotations, mypy/pyright type checking