[jackdaniel]

Common Lisp does not require TCO. This runs on emscripten port of Embeddable Common Lisp - this platform support is relatively new. I'm also working on WASI port and an optimizing compiler at runtime (currently we use bytecodes compiler when running).

[dartos]

Oh wow.

I always thought TCO was part of the spec itself.

[jackdaniel]

Scheme requires TCO. It is a different Lisp (it also has standard[s]).

[JoelMcCracken]

CL is not particularly functionally oriented. Many things like this are absent (or present, in some cases).