code: def trim(self, lower=None, upper=None):
          
          if lower is None:
              lower = getattr(self.subpars.eqi1, 'value', None)
          super().trim(lower, upper)
docs: Trim upper values in accordance with :math:`EQI1 \\leq EQB`.
  
          >>> from hydpy.models.lland import *
          >>> parameterstep('1d')
          >>> eqi1.value = 2.0
          >>> eqb(1.0)
          >>> eqb
          eqb(2.0)
          >>> eqb(2.0)
          >>> eqb
          eqb(2.0)
          >>> eqb(3.0)
          >>> eqb
          eqb(3.0)