Bug in new WiFi sleep option may explain 'battery killing'?

Although the WiFi sleep option defaults to the supposed old behavior (WiFi stays connected), it doesn't have any effect. In fact, from what I can tell, WiFi always disconnects when you're sleeping, now, after a minute or so, regardless of the setting.
I've tried re-doctoring without any effect - this option just seems broken (and set to the new, less battery-friendly option permanently).
Perhaps this helps to explain why people are saying 1.4 is 'killing their battery'?

Previously, it seemed that the phone stayed connected to WiFi - thus, if I was logged into AIM, or waiting for email, and I was in a low coverage zone, I would stay connected to the network.
Now, regardless of the setting, after a minute or so the phone disconnects from WiFi. (I can't really tell if it's powering WiFi off completely - it doesn't seem to be.) So, I'm logged out of AIM, and don't get email. If I wake up the device, things reconnect.
That's definitely not how it seemed to behave in 1.3.5.1 -- or, at least, there's been some other change, since the behavior is quite different. I don't think I'm remembering wrong... it was only a few days ago!

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