From @masak

<masak> nom​: my @​a = < a b c >; @​a.unshift(1); @​a.unshift(0);
@​a.unshift(2); @​a.unshift(""); @​a.unshift(3); @​a.unshift(4);
@​a.perl.say
<p6eval> nom 410361​: OUTPUT«Array.new(4, 3, 2, 1, "a", "b", "c")␤»
<masak> <japhb> Bug​: List.unshift won't unshift false values.
* masak submits rakudobug
<masak> niecza​: my @​a = < a b c >; @​a.unshift(1); @​a.unshift(0);
@​a.unshift(2); @​a.unshift(""); @​a.unshift(3); @​a.unshift(4);
@​a.perl.say
<p6eval> niecza v10-58-gc851cf8​: OUTPUT«[4, 3, "", 2, 0, 1, "a", "b",
"c"].list␤»

From @moritz

Now fixed in rakudo/nom.

@moritz - Status changed from 'new' to 'resolved'

From @moritz

... and tested in unshift.t, I forgot to say.