Commit 9e484a0 (and the subsequent c956a53) introduced a fallback for URL::previous(), taken from the session, in case the referer is empty.

Considering this method is usually used in some "navigation flow", I think this might be undesirable under some circumstances.

Take the following scenario: user navigates on the site, then open a new tab without referer (bookmark, direct input, whatever). This new tab will have a "previous url" completely unrelated.

Hence, this issue to ask for your thoughts.

For the record, I personally do this:

public function previousOr($fallback)
{
    return $this->to($this->request->header('referer', $fallback));
}