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class Dot {
    has $.x;
...

my $a = Dot.new(x => 23, y => 42, z => 2);
say $_ for $a.get;

    # Blindly accept x and y, but do extra checks on z:
    submethod BUILD(:$!x, :$!y, :$z) {
...
        die "z too big!" if $z > 10;
        $!z = $z;
    }