Can AudioNode.channelCount be zero?

The current spec doesn't say anything about it, and WebKit/Blink throw
INVALID_STATE_ERR.  I'd like to modify the spec to say that setting
channelCount to zero should throw, but I think a better exception code is
NOT_SUPPORTED_ERR.  Any objections?

--
Ehsan
<http://ehsanakhgari.org/>