printf %q represents null argument as empty string.

[Dan Douglas]

    $ set --; printf %q\\n "$@"
    ''

printf should perhaps only output '' when there is actually a corresponding
empty argument, else eval "$(printf %q ...)" and similar may give different 
results than expected. Other shells don't output '', even mksh's ${var@Q} 
expansion. Zsh's ${(q)var} does.
-- 
Dan Douglas

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