'--- tests added 16feb20 after pm#11113014 post ---', '"failing" (i.e., no transformation) tests', [ '' => '', ], [ '*' => '*', ], [ '*_/' => '*_/', ], [ ' * _ / ' => ' * _ / ', ], [ '*fail/' => '*fail/', ], [ ' * fail / ' => ' * fail / ', ], 'possibly questionable transformations', [ '__' => '', ], [ ' __ ' => ' ', ], [ '__ __' => ' ', ], [ ' __ __ ' => ' ', ], [ '____' => '', '???' ], [ ' ____ ' => ' ', '???' ], [ '______' => '', '???' ], [ ' ______ ' => ' ', '???' ], [ '________' => '', '???' ], [ ' ________ ' => ' ', '???' ], [ '__ __ __ __' => ' ', ], [ ' __ __ __ __ ' => ' ', ],