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The Perl equivalent for this is C<$#myarray>.
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Perl's C<$#array = $fill;>.

RJ
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trigger for I<container magics>, i.e. it will for C<%ENV> or C<%SIG>
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Assigning to C<$#days> actually changes the length of the array.
Shortening an array this way destroys intervening values
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    pod/perldata.pod

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364:X<$#> X<array, length>
373:    $#whatever = -1;
382:    scalar(@whatever) == $#whatever + 1;