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node_modules/array-last/node_modules/is-number/index.js

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+/*!
+ * is-number <https://github.com/jonschlinkert/is-number>
+ *
+ * Copyright (c) 2014-2017, Jon Schlinkert.
+ * Released under the MIT License.
+ */
+
+'use strict';
+
+module.exports = function isNumber(num) {
+  var type = typeof num;
+
+  if (type === 'string' || num instanceof String) {
+    // an empty string would be coerced to true with the below logic
+    if (!num.trim()) return false;
+  } else if (type !== 'number' && !(num instanceof Number)) {
+    return false;
+  }
+
+  return (num - num + 1) >= 0;
+};