> 0.x scope rules... In short, for non-toy programs, it's a significant source of hard-to-find bugs.

It seems like a lot of languages have lexical scoping which IIRC was what 0.x had. (Scheme, Lisp, OCaml are a few examples) Are there aspects of Julia that make lexical scoping particularly problematic? Julia 1.x scoping rules look similar to Tcl's.