@paul i knew that tcl existed for a long time (because eggdrop etc. ;) but only started to use it about 1 1/2 years ago. it's a really nice language imo, especially compared to other things which are more popular today.
i think the only thing missing are tcl-native libraries for some things. json handling isn't that great, the http-client-lib also is only "okish".
the language itself is 9/10.