6 has over => (is => 'ro', required => 1);
8 has values => (is => 'ro', default => sub { {} });
10 sub key_list { sort keys %{$_[0]->values} }
13 my ($self, $key) = @_;
14 return $self->values->{$key};
19 return DX::ArrayStream->from_array($self->all);
24 my $values = $self->values;
25 my @ret = @{$values}{sort keys %$values};
30 my ($self, $value) = @_;
31 return ref($self)->new(%$self, values => { %{$self->values} })
36 my ($self, $value) = @_;
37 $self->values->{$value->${\$self->over}} = $value;
42 my ($self, $value) = @_;
43 delete $self->values->{$value->${\$self->over}};