made index keeper a table entry to prevent such a 'global' upvalue to be accidentally changed
made index keeper a table entry to prevent such a 'global' upvalue to be accidentally changed

mpeterv/busted,nehz/busted,xyliuke/busted,Olivine-Labs/busted,ryanplusplus/busted,sobrinho/busted,istr/busted,DorianGray/busted,leafo/busted,o-lim/busted