nl_tokens: generation counter / * private : 32 - bit integer safe adder
pl_tokens: function <mask> ( x , y ) { var lsb = ( x & 0xffff ) + ( y & 0xffff ) ; var msb = ( x >>> 16 ) + ( y >>> 16 ) + ( lsb >>> 16 ) ; return ( msb << 16 ) | ( lsb & 0xffff ) ; }