fix Array.prototype.slice(); undefined elements don't affect result length
fix Array.prototype.slice(); undefined elements don't affect result length

thurday/duktape,eddieh/duktape,daimajia/duktape,kphillisjr/duktape,chenyaqiuqiu/duktape,zeropool/duktape,chenyaqiuqiu/duktape,thurday/duktape,skomski/duktape,reqshark/duktape,kphillisjr/duktape,markand/duktape,haosu1987/duktape,markand/duktape,zeropool/duktape,harold-b/duktape,chenyaqiuqiu/duktape,pombredanne/duktape,haosu1987/duktape,markand/duktape,jmptrader/duktape,haosu1987/duktape,svaarala/duktape,pombredanne/duktape,kphillisjr/duktape,eddieh/duktape,skomski/duktape,zeropool/duktape,harold-b/duktape,skomski/duktape,reqshark/duktape,harold-b/duktape,haosu1987/duktape,rwaldron/duktape,haosu1987/duktape,jmptrader/duktape,skomski/duktape,reqshark/duktape,pombredanne/duktape,rwaldron/duktape,jmptrader/duktape,rwaldron/duktape,eddieh/duktape,skomski/duktape,nivertech/duktape,markand/duktape,thurday/duktape,kphillisjr/duktape,zeropool/duktape,nivertech/duktape,tassmjau/duktape,zeropool/duktape,nivertech/duktape,nivertech/duktape,svaarala/duktape,thurday/duktape,zeropool/duktape,nivertech/duktape,eddieh/duktape,svaarala/duktape,sloth4413/duktape,svaarala/duktape,thurday/duktape,sloth4413/duktape,sloth4413/duktape,svaarala/duktape,jmptrader/duktape,kphillisjr/duktape,sloth4413/duktape,thurday/duktape,kphillisjr/duktape,skomski/duktape,pombredanne/duktape,harold-b/duktape,nivertech/duktape,reqshark/duktape,harold-b/duktape,eddieh/duktape,reqshark/duktape,reqshark/duktape,skomski/duktape,sloth4413/duktape,eddieh/duktape,sloth4413/duktape,jmptrader/duktape,tassmjau/duktape,markand/duktape,harold-b/duktape,jmptrader/duktape,sloth4413/duktape,chenyaqiuqiu/duktape,markand/duktape,tassmjau/duktape,kphillisjr/duktape,nivertech/duktape,rwaldron/duktape,haosu1987/duktape,pombredanne/duktape,daimajia/duktape,kphillisjr/duktape,kphillisjr/duktape,pombredanne/duktape,chenyaqiuqiu/duktape,harold-b/duktape,nivertech/duktape,haosu1987/duktape,eddieh/duktape,zeropool/duktape,haosu1987/duktape,daimajia/duktape,svaarala/duktape,nivertech/duktape,rwaldron/duktape,skomski/duktape,zeropool/duktape,chenyaqiuqiu/duktape,svaarala/duktape,jmptrader/duktape,pombredanne/duktape,tassmjau/duktape,skomski/duktape,kphillisjr/duktape,eddieh/duktape,pombredanne/duktape,sloth4413/duktape,jmptrader/duktape,tassmjau/duktape,eddieh/duktape,daimajia/duktape,pombredanne/duktape,thurday/duktape,markand/duktape,eddieh/duktape,reqshark/duktape,thurday/duktape,reqshark/duktape,chenyaqiuqiu/duktape,jmptrader/duktape,thurday/duktape,zeropool/duktape,harold-b/duktape,sloth4413/duktape,tassmjau/duktape,reqshark/duktape,markand/duktape,haosu1987/duktape,rwaldron/duktape,reqshark/duktape,nivertech/duktape,jmptrader/duktape,zeropool/duktape,tassmjau/duktape,pombredanne/duktape,tassmjau/duktape,markand/duktape,tassmjau/duktape,harold-b/duktape,skomski/duktape,chenyaqiuqiu/duktape,tassmjau/duktape,haosu1987/duktape,thurday/duktape,svaarala/duktape,svaarala/duktape,harold-b/duktape,chenyaqiuqiu/duktape,daimajia/duktape,markand/duktape,daimajia/duktape,sloth4413/duktape,chenyaqiuqiu/duktape