Attempt to document Baggy.keys

gistfile1.txt

=head2 method keys

Defined as:

    method keys(Baggy:D:) returns List:D

Returns a list of all keys in the C<Baggy> object without taking
their individual weights into account as opposed to L<kxxv|#method kxxv>.

    my $breakfast = bag <eggs spam spam spam>;
    say $breakfast.keys;                             # (spam eggs)

    my $n = ("a" => 0, "b" => 2).BagHash;
    say $n.keys;                                     # (b)