issue with auto_typography

[eluser]GSV Sleeper Service[/eluser]
forget about $this->badger->mushroom("snake"), it was just an example, it means nothing and has nothing to do with this problem. let me explain again

I create some text eg

here is some text<code>example code goes here</code>

when I pass this text through auto_typography() I get

[code]<p>here is some text</p><code>example code goes here</p></code>[code]

and as you can see, an extra close paragraph tag is being added within the code tag.