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POSIX says
> When using the symbolic mode form on a regular file, it is
> implementation-defined whether or not:
>
> - Requests to set the set-user-ID-on-execution or set-group-ID-on-
> execution bit when all execute bits are currently clear and none
> are being set are ignored.
And indeed, illumos ignores them with a warning:
chmod: WARNING: /tmp/bfs.XXXX7KaGWb/rainbow/suid: Execute permission
required for set-ID on execution
Link: https://pubs.opengroup.org/onlinepubs/9699919799/utilities/chmod.html
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