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  DB<28> \@x
 => [1, 2, 3, undef, 5, 6, 7, 8, 9, 10]
...

  DB<30> @a=List::Util::first { $_ eq "never" } @x; \@a
 => [undef]

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  DB<38> @a=grep { !$_ } @x; \@a
 => [undef]

  DB<39> @a=grep { $_ eq "never" } @x; \@a
 => []