camelCase directives not working

I created a custom directive called 'eventListner'. After registering it
and trying out a test reST document docutils told me that this was an
unknown directive. Much confusion later, I finally figured out that if I
renamed the directive to 'eventlistner' everything worked fine. Is this a
feature or a bug? I looked through the list archive but couldn't find
anything obvious about this.

I admit that camelCase as a directive name is probably generally not a good
idea, but since this is a shortcut for the javascript function
'eventListner' it seemed appropriate.

Cheers,
Robin.

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