Ensure fp _.partial and _.partialRight accept an args param.

fp/_baseConvert.js

@@ -29,7 +29,8 @@ function baseConvert(util, name, func) {
     'isFunction': util.isFunction,
     'iteratee': util.iteratee,
     'keys': util.keys,
-    'rearg': util.rearg
+    'rearg': util.rearg,
+    'rest': util.rest
   };
 
   var ary = _.ary,
@@ -38,7 +39,8 @@ function baseConvert(util, name, func) {
       each = _.forEach,
       isFunction = _.isFunction,
       keys = _.keys,
-      rearg = _.rearg;
+      rearg = _.rearg,
+      spread = _.spread;
 
   var baseArity = function(func, n) {
     return n == 2
@@ -168,9 +170,13 @@ function baseConvert(util, name, func) {
       each(mapping.aryMethod[cap], function(otherName) {
         if (name == otherName) {
           var aryN = !isLib && mapping.iterateeAry[name],
-              reargIndexes = mapping.iterateeRearg[name];
+              reargIndexes = mapping.iterateeRearg[name],
+              spreadStart = mapping.methodSpread[name];
+
+          result = spreadStart === undefined
+            ? ary(func, cap)
+            : spread(func, spreadStart);
 
-          result = ary(func, cap);
           if (cap > 1 && !mapping.skipRearg[name]) {
             result = rearg(result, mapping.methodRearg[name] || mapping.aryRearg[cap]);
           }
@@ -198,6 +204,9 @@ function baseConvert(util, name, func) {
   if (!isLib) {
     return wrap(name, func);
   }
+  // Add placeholder alias.
+  _.__ = placeholder;
+
   // Iterate over methods for the current ary cap.
   var pairs = [];
   each(mapping.caps, function(cap) {