Comment by pdw

I've recently spent some time experimenting with Tcl, and I've developed some affection for it, but what tripped me up is that "everything is a string" means that Tcl is one of the few truly weakly typed languages. This Tcl notation:

    {a b}

might represent any of the following data structures in JSON notation:

    "a b"
    ["a", "b"]
    [["a"], ["b"]]
    {"a": "b"}
    {"a": ["b"]}

This can make reading some Tcl code quite a puzzle.