code: def exact_path
        return nil if has_double_star || exact_parts.any? { |part| part.nil? }
        result = ChefFS::PathUtils::join(*exact_parts)
        is_absolute ? ChefFS::PathUtils::join('', result) : result
      end
docs: If this pattern represents an exact path, returns the exact path.
  
     abc/def.exact_path == 'abc/def'
     abc/*def.exact_path == 'abc/def'
     abc/x\\yz.exact_path == 'abc/xyz'