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Fixes #2230.
Summary
append/prepend
on two series, the hierarchy and components names of the series with the "earlier" index are retainedappend/prepend_values
, the hierarchy and components of the series are retainedOther Information
Not sure if the hierarchy should be retained or not. Since the components don't change, it should be easy to assign the "old" hierarchy to resulting series but at the same time, adding values should not affect the relationship between the components so keeping by default sounds reasonnable.