The expression 0..9 x 2 evaluates as 0 .. (9 x 2). Put parentheses around the range op: 
    print +(0..9) x 2, "\n";

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See perlop for the list of operator precedences. Hmm, or perlop (man page).
The table appears somewhat mangled on [doc://perlop].

In reply to Re: Seemingly odd behavior of sequence by oiskuu
in thread Seemingly odd behavior of sequence by jar00n

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