rbush MSIE8 bug

rbush-msie8-bug.js

var bush = rbush();

bush.insert( [-449,235,-329,277,] );
bush.insert( [-449,262,-425,286,] );
bush.insert( [-215,200,-49,242,]  );
bush.insert( [-215,227,-191,251,] );
bush.insert( [222,98,298,140,]    );
bush.insert( [222,125,246,149,]   );
bush.insert( [388,184,468,226,]   );
bush.insert( [388,211,412,235,]   );
bush.insert( [489,296,561,338,]   );
bush.insert( [489,323,513,347,]   );
bush.insert( [328,646,441,688,]   );
bush.insert( [328,673,352,697,]   );
bush.insert( [437,57,523,99,]     );
bush.insert( [437,84,461,108,]    );
bush.insert( [-341,328,-227,370,] );
bush.insert( [-341,355,-317,379,] );
bush.insert( [242,404,308,446,]   );
bush.insert( [242,431,266,455,]   );
bush.insert( [294,178,358,220,]   );
bush.insert( [294,205,318,229,]   );
bush.insert( [885,193,954,235,]   );
bush.insert( [885,220,909,244,]   );
bush.insert( [432,448,505,490,]   );
bush.insert( [432,475,456,499,]   );
bush.insert( [831,476,909,518,]   );
bush.insert( [831,503,855,527,]   );
bush.insert( [-198,415,-123,457,] );
bush.insert( [-198,442,-174,466,] );
bush.insert( [401,262,460,304,]   );
bush.insert( [401,289,425,313,]   );
bush.insert( [914,254,1006,296,]  );
bush.insert( [914,281,938,305,]   );
bush.insert( [1018,223,1084,265,] );
bush.insert( [1018,250,1042,274,] );
bush.insert( [637,331,718,373,]   );
bush.insert( [637,358,661,382,]   );
bush.insert( [-179,643,-90,685,]  );
bush.insert( [-179,670,-155,694,] );
bush.insert( [725,310,803,352,]   );
bush.insert( [725,337,749,361,]   );
bush.insert( [-23,575,116,617,]   );
bush.insert( [-23,602,1,626,]     );
bush.insert( [1083,646,1160,688,] );
bush.insert( [1083,673,1107,697,] );
bush.insert( [873,311,981,353,]   );
bush.insert( [873,338,897,362,]   );
bush.insert( [-319,264,-237,305,] );
bush.insert( [-319,290,-295,314,] );
bush.insert( [397,109,446,150,]   );
bush.insert( [397,135,421,159,]   );
bush.insert( [617,183,706,224,]   );
bush.insert( [617,209,641,233,]   );
bush.insert( [202,190,271,231,]   );
bush.insert( [202,216,226,240,]   );
bush.insert( [326,20,427,61,]     );