make indexes more stable for incorrect values like undefined or NaN
make indexes more stable for incorrect values like undefined or NaN

tyanas/basisjs,smelukov/basisjs,smelukov/basisjs,smelukov/basisjs,basisjs/basisjs,tyanas/basisjs,tyanas/basisjs,fateevv/basisjs,fateevv/basisjs,basisjs/basisjs,fateevv/basisjs,istrel/basisjs,istrel/basisjs,istrel/basisjs,basisjs/basisjs