[anougaret]

Will def. do a technical write up! Wanted to do a more target approach like you around valid mutations only but I think users want to observe variables not only where they are written but also where they are read, so a low hanging fruit was to wrap all the expressions I could (hundreds of lines of AST queries and tricks per language) with functions/lambdas and some sort of "logging". Of course this is only 4 weeks in the making so there is so much more to do. And as you guessed you probably can't do the targeted approach well in Python and others.