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[bug] () { echo $#} $'' is zero

Subject says it all. The empty string $'' is not passed to commands the same
way the empty strings "" and '' are:

    $ count () { echo $#; }
    $ count ""    # okay
    1
    $ count ''    # sure
    1
    $ count $''   # huh?
    0

Any clue as to what's going on?
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