+ improved test case coverage
+ improved test case coverage

whackashoe/json,stanmihai4/json,Newbrick/json,whackashoe/json,Newbrick/json,theodelrieu/json,nlohmann/json,xzmagic/json,Cloudage/json,nickhen/json,theodelrieu/json,stanmihai4/json,stanmihai4/json,xdcesc/json,robertmrk/json,kaidokert/json,hunter-packages/json,aestuarium/json,emvivre/json,daminetreg/json,silverweed/json,AALEKH/json,hunter-packages/json,bestwpw/json,ruppmatt/json,erichkeane/json,nlohmann/json,kaidokert/json,Newbrick/json,whoshuu/json,nlohmann/json,kaidokert/json,hunter-packages/json