$chan.isvoice
Checks if a user is at least voiced on a channel
Usage
<boolean> $chan.isvoice(<nickname:string>[,<window_id:string>])
Description
Returns 1 if <nickname> is at least voiced on the channel identified by <window_id>, and 0 otherwise.
If <window_id> is not specified the current window is used (assuming that it is a channel at all).
If the window is not a channel, a warning is printed and an empty string is returned.
Note that if the user is not on the channel at all, you will get 0 as return value.

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