Taking the LeastRecentSubjects example. I'm going to assume you have
time=0 on the left and time>0 on the right: 1, 2, 1, 3, 4.

Then "One event for each subject only, ordered with oldest events first"
would definitely mean: 1, 2, 3, 4. If we are sorting like RainCT is
proposing then the docstring should probably be "The most recent event
for each subject, ordered with the oldest events first" or something
like that.

That said I am actually not sure at all what the right API is. WHich use
cases do we have?

Wrong understanding of the LeastRecentActors
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Status in Zeitgeist Framework: New

Bug description:
In an attempt to work on bug #641968 I discovered that we some of us defer on 
the understanding of LeastRecentActor

The documentation stated that LeastRecentActor = enum_factory(("The first event 
of each different actor"))

Let's assume we have sequential events. (The actors are defined by numbers)

2, 1, 3, 2, 1, 4

So we have 4 different actors (1,2,3,4) and we want to sort them by least 
the least recent is not 2 or 1 since they are used again at the end. the least 
recent is 3

This means LeastRecentActors should return the latest actors sorted ASC:

3, 2, 1, 4

and not

2, 1, 3, 4

When we look at LeastRecentSubjects = enum_factory(("One event for each subject 
only, "
  "ordered with oldest events first"))
My understanding according to Siegfried is:

<seif_> RainCT,
<seif_> LeastRecentSubjects = enum_factory(("One event for each subject only, "
<seif_>   "ordered with oldest events first")
<seif_> so i f i have
<seif_> the subject
<seif_> 1, 2, 1, 3, 4
<seif_> what do i get returned
<seif_> 1, 2, 3, 4
<seif_> or
<seif_> 2, 1, 3, 4
<seif_> ?
<RainCT> seif_: the later
<RainCT> for each subject you only look at the most recent one
<seif_> ok then we should do the same for the actors :)
<RainCT> Yes. Isn't it like this already?
<seif_> no

In that case if we follow this convention I can update the doc strings and 
already have the bug fix for both this bug and #641968

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