raku json round-trip

gistfile1.txt

> my @arr = 1,2,3; my $json = (to-json @arr); my @arr2 = from-json $json; @arr2.say
[[1 2 3]]

> class FromJson { has @.arr; has $.foo }
(FromJson)
> my $item = from-json '{ "arr": [1,2,3], "foo": "a value"}';
{arr => [1 2 3], foo => a value}
> FromJson.new(|$item)
FromJson.new(arr => [[1, 2, 3],], foo => "a value")