docs: function(channel, fn, context){
        if (!channels[channel]) return;
  
        var subscription;
        for (var i = 0; i < channels[channel].length; i++) {
          subscription = channels[channel][i];
          if (subscription.fn === fn && subscription.context === context) {
            channels[channel].splice(i, 1);
            i--;
          }
        }
      }