A design limit this component's configuration breaks.
Reported rather than raised. A bend tighter than the tube's minimum radius
is buildable -- somebody will build it -- and the model should still solve
so you can see what it costs, while saying clearly that the hardware is out
of spec. Raising would force a choice between modelling reality and
modelling the rules.
Phase 15's constraint API generalises this: MEOP, NPSH margin, injector
stiffness and structural limits are the same shape of statement.
Definition at line 130 of file base.py.