Bump to v4.1.0.

_isLaziable.js

@@ -0,0 +1,27 @@
+import LazyWrapper from './_LazyWrapper';
+import getData from './_getData';
+import getFuncName from './_getFuncName';
+import lodash from './wrapperLodash';
+
+/**
+ * Checks if `func` has a lazy counterpart.
+ *
+ * @private
+ * @param {Function} func The function to check.
+ * @returns {boolean} Returns `true` if `func` has a lazy counterpart, else `false`.
+ */
+function isLaziable(func) {
+  var funcName = getFuncName(func),
+      other = lodash[funcName];
+
+  if (typeof other != 'function' || !(funcName in LazyWrapper.prototype)) {
+    return false;
+  }
+  if (func === other) {
+    return true;
+  }
+  var data = getData(other);
+  return !!data && func === data[0];
+}
+
+export default isLaziable;