https://bugzilla.wikimedia.org/show_bug.cgi?id=30821

--- Comment #1 from Brion Vibber <br...@wikimedia.org> 2011-09-08 23:21:58 UTC 
---
Returning true usually indicates that you are passing regular control back to
the caller, as if you were never there.

Returning false short-circuits further processing, and in a case like this you
have a chance to also return some override value through the $result outparam.
You can then return either true or false in there, as I understand.

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