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This make Nvim recognize `ESC NUL` as <M-C-Space>, as many terminal emulators (including libvterm) send <M-C-Space> as `ESC NUL`. There is already another unambiguous way to encode a `ESC` key supported by libtermkey: `ESC [ 2 7 u`, which is a `CSI u` sequence. If one still wants to use `ESC NUL` as `ESC`, they can just map <M-C-Space> to <Esc>.