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I've been working on implementing callable words in #uxntal.

Instead of the typical PUSH->POP->JSR sequence each time you want to run a routine, these tokens are not pushing to the stack - they'll run immediately.

They'll be impractical for doing pointer arithmetic, but save 1 byte for every subroutine call, and will save millions of cycles in a project of the size of a text editor or drawing software.

They don't break compatibility with old roms, and make source files a bit more readable.