Can't use Series.greater_equal/2 on datetime column, despite documentation suggesting it is possible

[astutecat]

Hi!

I am trying to use Series.greater_equal/2 on a column that has a dtype of :datetime and I am getting an error:

** (ArgumentError) Explorer.Series.greater_equal/2 not implemented for dtype {:datetime, :microsecond, "Etc/UTC"}. Valid dtypes are :date, :time, {:duration, :microsecond}, {:duration, :millisecond}, {:duration, :nanosecond}, {:f, 32}, {:f, 64}, {:naive_datetime, :microsecond}, {:naive_datetime, :millisecond}, {:naive_datetime, :nanosecond}, {:s, 8}, {:s, 16}, {:s, 32}, {:s, 64}, {:u, 8}, {:u, 16}, {:u, 32} and {:u, 64}

This is odd since the documentation seems to suggest that :datetime is supported, but this error suggests it is not -- I am wondering if this guard needs updated to support datetimes, or if the documentation is not accurate in stating that datetimes are supported.

For reference, I'm on explorer 0.11.1 at the moment.