docs: def get (self, name, default=None):
          """Returns the attribute value *AitConfig.name* or *default*
          if name does not exist.
  
          The name may be a series of attributes separated periods.  For
          example, "foo.bar.baz".  In that case, lookups are attempted
          in the following order until one succeeeds:
  
              1.  AitConfig['foo.bar.baz'], and
              2.  AitConfig.foo.bar.baz
              3.  (If both fail, return *default*)
          """
          if name in self:
              return self[name]
  
          config = self
          parts  = name.split('.')
          heads  = parts[:-1]
          tail   = parts[-1]
  
          for part in heads:
              if part in config and type(config[part]) is AitConfig:
                  config = config[part]
              else:
                  return default
  
          return config[tail] if tail in config else default