Tweaked check for preserved sign; added LCOV_EXCL_LINE
Tweaked check for preserved sign; added LCOV_EXCL_LINE

stanmihai4/json,Newbrick/json,kaidokert/json,kaidokert/json,stanmihai4/json,kaidokert/json,hunter-packages/json,nlohmann/json,theodelrieu/json,Newbrick/json,hunter-packages/json,nlohmann/json,nlohmann/json,stanmihai4/json,Newbrick/json,hunter-packages/json,theodelrieu/json