Same goes for excludedNodes within PPickPath.  It's implementation is
as a HashMap that maps from PNode to PNode, but it's only ever used as
a Set.

On Jul 4, 9:22 pm, allain <allain.lalo...@gmail.com> wrote:
> Within PObjectOutputStream, there's a curious field called
> unconditionallyWritten and it's a map from an Object to a Boolean.  It
> only gets set to Boolean.True and seems to be playing the role of a
> Set.
>
> Can anyone explain to me the reason for this particular field being
> defined as a Map. Seems like it'd be simpler and possibly more
> efficient to define it as a Set.
>
> Thanks,
>
> Allain
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