I wrote one for Tcl years ago, as I started working on a really complicated product with around 50k lines of code (or more, distant memory). Maybe I should giv

I wrote one for Tcl years ago, as I started working on a really complicated product with around 50k lines of code (or more, distant memory). Maybe I should give it another crack for modern languages - there is an even greater need for it these days with dependency injection and microservices being common. The way I see it the need stems from needing to understand what is REALLY going on, as opposed to what the code is saying should be going on.