Add fp/placeholder module.

fp/_baseConvert.js

@@ -1,6 +1,6 @@
 var mapping = require('./_mapping'),
     mutateMap = mapping.mutate,
-    fallbackHolder = {};
+    fallbackHolder = require('./placeholder');
 
 /**
  * The base implementation of `convert` which accepts a `util` object of methods

fp/placeholder.js

@@ -0,0 +1,6 @@
+/**
+ * The default argument placeholder value for methods.
+ *
+ * @type {Object}
+ */
+module.exports = {};

lib/fp/build-modules.js

@@ -97,8 +97,7 @@ function build(target) {
   _.each([mapping.aliasToReal, mapping.remap], function(data) {
     _.forOwn(data, function(realName, alias) {
       var modulePath = path.join(target, alias + '.js');
-      if (!_.startsWith(alias, '_') &&
-          !_.includes(modulePaths, modulePath)) {
+      if (!_.includes(modulePaths, modulePath)) {
         modulePaths.push(modulePath);
       }
     });

lib/fp/template/modules/module.jst

@@ -1,2 +1,5 @@
-var convert = require('./convert');
-module.exports = convert('<%= name %>', require('../<%= _.result(mapping.remap, name, name) %>'));
+var convert = require('./convert'),
+    func = convert('<%= name %>', require('../<%= _.result(mapping.remap, name, name) %>'));
+
+func.placeholder = require('./placeholder');
+module.exports = func;