Watch command failed to display special characters

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That looks right to me. You can test it with:

nix-shell \
  --packages 'procps.overrideAttrs (a: {
    configureFlags = a.configureFlags ++ [ "--enable-watch8bit" ];
  })' \
  --run 'watch echo ✓'

I’d recommend opening an issue in nixpkgs to add this flag by default. Debian, Arch, and Red Hat already do in their packaging.

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