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For me, the most interesting thing about Forth is it's "thin-ness". Getting from machine code to a Forth REPL can take about 4 kilobytes.

Same, people often described it as the lisp of assembly. You get a lot of freedom of abstraction over almost direct bare metal.

Yes. Or "Lisp for hardware nerds." ;)

Exactly, and if you build your inner interpreter properly it is wicked fast.