Add different sort logic

gipp.bib

@@ -1756,7 +1756,7 @@
 }
 
 @inproceedings{GreinerPetter2020,
-  author    = {Greiner-Petter, Andr{\'{e}} and Schubotz, Moritz and M\"{u}ller, Fabian and Breitinger, Corinna and S. Cohl, Howard and Aizawa, Akiko and Gipp, Bela},
+  author    = {Greiner-Petter, Andr{\'{e}} and Schubotz, Moritz and M\"{u}ller, Fabian and Breitinger, Corinna and Cohl, Howard S. and Aizawa, Akiko and Gipp, Bela},
   booktitle = {Proceedings of The Web Conference 2020 (WWW'20), April 20--24, 2020, Taipei, Taiwan},
   core      = {0;Core Rank A*;http://portal.core.edu.au/conf-ranks/1548/},
   date      = {2020-04},

src/biber/filter.xml

@@ -40,7 +40,7 @@
             <map map_overwrite="1">
                 <map_step map_field_set="sortkey" map_field_value="D"/>
                 <map_step map_field_source="core"/>
-                <map_step map_field_set="sortkey" map_origfieldval="0"/>
+                <map_step map_field_set="sortkey" map_origfieldval="1"/>
             </map>
         </maps>
     </sourcemap>