more work

node_modules/lodash/internal/isLength.js

@@ -0,0 +1,20 @@
+/**
+ * Used as the [maximum length](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-number.max_safe_integer)
+ * of an array-like value.
+ */
+var MAX_SAFE_INTEGER = Math.pow(2, 53) - 1;
+
+/**
+ * Checks if `value` is a valid array-like length.
+ *
+ * **Note:** This function is based on [`ToLength`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-tolength).
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
+ */
+function isLength(value) {
+  return typeof value == 'number' && value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
+}
+
+module.exports = isLength;