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sorry didn't knew the channel

When asking something specific like about a library (#klaxon), process (#serialization) or technique (#functional) it's always worth it to hit Ctrl/Cmd + K first and check if a channel for that topic exists 🙂 Of course no harm done, nothing to be too sorry about, but that can save you and others some time 🙂

hmm it shows only existing openned channels, not all 🙂

strange, for me it shows all channels, you have to start typing what you're searching for though. If you want to just browse (if you don't know what to type even approximately or you want to see what is available) you can click on Channels in the left pane, it will show all channels and let you filter them.