User "Catrope" posted a comment on MediaWiki.r93759.

Full URL: 
https://secure.wikimedia.org/wikipedia/mediawiki/wiki/Special:Code/MediaWiki/93759#c20561
Commit summary:

Introduce a hook so extensions can customize what's considered to be a CSS/JS 
page. This is needed for the Gadgets extension in the RL2 branch

Comment:

And what would we do differently if it's true or false? The documentation is 
maybe a bit terse, but the idea is that this hook works just like userCan: 
change &$retval to change the return value, and return true/false to 
allow/prevent other hooks from running. The latter is done by wfRunHooks() 
behind the scenes.

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