CommDataHandleIF::fixed(s)ize deprecation doesn't seem to work

For Dune releases/2.7 (gcc 8.3.0):

If I change the function fixedsize to fixedSize in my classes deriving from CommDataHandleIF I get the following compiler error (I dotted out the class names):

/home/timok/dumux-dune-master/dune-grid/dune/grid/common/datahandleif.hh:130:46: error: comparison between distinct pointer-to-member types ..... lacks a cast
       bool hasOverwrittenFixedSize = basePtr != derPtr;
                                      ~~~~~~~~^~~~~~~~~

Is it possible that noone noticed that this function was deprecated 3 years ago? It has been recently removed in 8d68748c.

@oliver.sander you deprecated the interface and implemented the offending code that is supposed to allow for a smooth transition.