docs: def const(const):
      '''Convenience wrapper to yield the value of a constant'''
      try:
          return getattr(_c, const)
      except AttributeError:
          raise FSQEnvError(errno.EINVAL, u'No such constant:'\
                                 u' {0}'.format(const))
      except TypeError:
          raise TypeError(errno.EINVAL, u'const name must be a string or'\
                          u' unicode object, not:'\
                          u' {0}'.format(const.__class__.__name__))