mine also, leave out the kinds, tags can be descriptive kinds are all over the place, sometimes one kind means 5 different actual messages, sometimes 4 kinds are actually 4 different messages. there's just no need for them when they could have meaningful tags also, the whole thing of single letter keys being indexed is stupid. considering a tag key is typically going to be a word no more than 12 characters long, you can jush hash it and take 4 bytes and done. index them all