how do I set the channel image in an RSS feed created with Zend_Feed_Writer?

I can't find an开发者_运维技巧y setImage method.

Using Zend Framework 1.10.2 (1.10.3 was released today, but I didn't see any mention of Zend_Feed_Writer at all in the changelog).

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It appears that there was no such functionality in 1.10.3.
I opened a ticket for it, and such functionality was added for 1.10.5