PositionUnit.constrained constructor
      const
      PositionUnit.constrained({ 
    
    
- required PositionUnit position,
- PositionUnit min,
- PositionUnit max,
Implementation
const factory PositionUnit.constrained({
  required PositionUnit position,
  PositionUnit min,
  PositionUnit max,
}) = _ConstrainedPosition;