Make fp versions of set and setWith immutable.

lib/fp/base.js

@@ -22,6 +22,7 @@ function baseConvert(util, name, func) {
 
   var _ = isLib ? func : {
     'ary': util.ary,
+    'cloneDeep': util.cloneDeep,
     'curry': util.curry,
     'forEach': util.forEach,
     'isFunction': util.isFunction,
@@ -31,6 +32,7 @@ function baseConvert(util, name, func) {
   };
 
   var ary = _.ary,
+      cloneDeep = _.cloneDeep,
       curry = _.curry,
       each = _.forEach,
       isFunction = _.isFunction,
@@ -90,6 +92,21 @@ function baseConvert(util, name, func) {
     };
   };
 
+  var immutSetWrap = function(func) {
+    return function() {
+      var index = -1,
+          length = arguments.length,
+          args = Array(length);
+
+      while (++index < length) {
+        args[index] = arguments[index];
+      }
+      args[0] = cloneDeep(args[0]);
+      func.apply(undefined, args);
+      return args[0];
+    };
+  };
+
   var iterateeAry = function(func, n) {
     return function() {
       var length = arguments.length,
@@ -160,6 +177,9 @@ function baseConvert(util, name, func) {
     else if (mutateMap.object[name]) {
       func = immutObjectWrap(func);
     }
+    else if (mutateMap.set[name]) {
+      func = immutSetWrap(func);
+    }
     var result;
     each(mapping.caps, function(cap) {
       each(mapping.aryMethodMap[cap], function(otherName) {