>   Spec Bag.kxxv

It's a clever name...but maybe too clever?

I find it unfortunate that a method that only returns keys has a 'v'
in its name.
Up to now, we've had a more predictable pattern to naming these accessors.

How about one of:



And what is the use-case for this?
I can see that I might want:




already does that.

I guess you might want to separate out the steps for some reason:

    my $selection = median_value_from( $bag.kxxv );

but that would be far more readable/maintainable as:

    my $selection = median_value_from( $bag.distribution );


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