--- /dev/null
+// `SameValue` abstract operation
+// https://tc39.github.io/ecma262/#sec-samevalue
+module.exports = Object.is || function is(x, y) {
+ // eslint-disable-next-line no-self-compare
+ return x === y ? x !== 0 || 1 / x === 1 / y : x != x && y != y;
+};