Fix - API: `sum()` method should have a default value
Fix - API: `sum()` method should have a default value

eveoh/Plugins,SGCreations/Plugins,KRQW/Plugins,radlr/Plugins,ran-guin/Plugins,husnixs/Plugins,cbondo/Plugins,NomadeLampe/Plugins,ashishraikar/Plugins,shamim8888/Plugins,prate3k/Plugins-1,husnixs/Plugins,cbondo/Plugins,afelicioni/DataTables-Plugins,afelicioni/DataTables-Plugins,ran-guin/Plugins,etd-framework/datatables-plugins,etd-framework/datatables-plugins,shamim8888/Plugins,cbondo/Plugins,radlr/Plugins,husnixs/Plugins,KRQW/Plugins,KRQW/Plugins,afelicioni/DataTables-Plugins,SGCreations/Plugins,prate3k/Plugins-1,prate3k/Plugins-1,shamim8888/Plugins,radlr/Plugins,modulexcite/Plugins,modulexcite/Plugins,ashishraikar/Plugins,etd-framework/datatables-plugins,NomadeLampe/Plugins,eveoh/Plugins,NomadeLampe/Plugins,ran-guin/Plugins,SGCreations/Plugins,eveoh/Plugins,ashishraikar/Plugins,modulexcite/Plugins