I just spent a fair amount of time trying to figure out why a search expression wasn't working, only to realize that it was because I had "isRepeating:yes" instead of "isRepeating:true".

It seems fairly easy to make "yes" a synonym to "true", and "no" a synonym to "false" (although I recognize that implementing all the various translations might be slightly painful).

I'd ask you please to consider it nonetheless.