[Questions] Why is the path_class not used internally?

[XSven]

The constructor new() contains lines like

$self->{data}        = $ENV{XDG_DATA_HOME}   || "$local\\.local\\share\\";
...
$self->{data}        = $ENV{XDG_DATA_HOME}   || "$home/.local/share/";

Why is the path_class attribute not used to created the fallback dirs if the XDG_ environment variables are not set

$self->{data}        = $ENV{XDG_DATA_HOME}   || $self->_dir($local, '.local', 'share');
...
$self->{data}        = $ENV{XDG_DATA_HOME}   || $self->_dir($home, '.local', 'share');

[XSven]

This question is applicable to the t/file_xdg.t test script too. Why not replacing

is($xdg->data_home, dir($base, '.local/share/test'), 'user-specific app data');

with

is($xdg->data_home, dir($base, qw( .local share test )), 'user-specific app data');

for example?