$chan.mode
Returns the mode string of a channel
Usage
<string> $chan.mode
<string> $chan.mode(<window_id:string>)
Description
Returns the mode string of the channel identified by <window_id>.
If no <window_id> is passed, the current channel mode string is returned (assuming that the current window is a channel at all).
If the window is not a channel, a warning is printed and an empty string is returned.

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