--- /dev/null
+// https://gist.github.com/BrendanEich/4294d5c212a6d2254703
+var $export = require('./_export');
+
+$export($export.S, 'Math', {
+ isubh: function isubh(x0, x1, y0, y1){
+ var $x0 = x0 >>> 0
+ , $x1 = x1 >>> 0
+ , $y0 = y0 >>> 0;
+ return $x1 - (y1 >>> 0) - ((~$x0 & $y0 | ~($x0 ^ $y0) & $x0 - $y0 >>> 0) >>> 31) | 0;
+ }
+});
\ No newline at end of file