[Perl 6]: Small discoveries VII, Flattening

[holli]

Perl 6 tries to flatten lists. This:

my $a = [[["hello"]]]; #not a 3d array!, same as: ["hello"]

is not what you might think it is, as single element lists get flattened. To get what you mean you must write

my $a = [[["hello"],],]; #now it is!

Note the trailing comma. See also 2015 The Year of The Great List Refactor.