Modern Tcl has all of these, you know? "Everything is a string" should actually be "everything has a string representation allowing for lossless roundtrip", but it's a bit less snappy; maybe you mean the lack of typing and I'd kind of agree with you here, though it's what makes Tcl's weird homoiconicity work.

Tcl lists are arrays (and kind of deques since https://core.tcl-lang.org/tips/doc/trunk/tip/625.md), dicts are the first-class maps we should have had since the beginning and apply allows to build closures around it.