You remember wrong.

    var a : array of integer;
        b : array[0..9] of integer;
        c : array[1..10] of integer;  
    begin
        writeln(low(a));    // 0
        writeln(high(a));   // -1
        writeln(low(b));    // 0
        writeln(high(b));   // 9
        writeln(low(c));    // 1
        writeln(high(c));   // 10
    end.

Strings started at 1 because 0th byte was holding the string length.