[Pharo-project] Small Spec / Announcement question.

[Goubier Thierry]

Is there a reason for the use or lack of weak in whenChanged for 
NewValueHolder ?

NewValueHolder>>whenChanged:do:
        announcer weak on:do:
NewValueHolder>>whenChangedSend:to:
        announcer on:send:to:
Thanks,

Thierry
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Thierry Goubier
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