fix incorrect value for request.includeType

lib/request/end.js

@@ -2,6 +2,7 @@
 
 var map = require('../common/array/map')
 var promise = require('../common/promise')
+var assign = require('../common/assign')
 
 
 /**
@@ -41,21 +42,20 @@ module.exports = function (context) {
       return Promise.all(map(includeTypes, function (includeType) {
         // This is useful for output hooks to know which type that the current
         // record belongs to. It is temporary and gets deleted later.
-        request.includeType = includeType
+        var ctx = assign({}, context)
+        ctx.request = assign({}, request)
+        ctx.request.includeType = includeType
 
         return Promise.all(map(include[includeType], function (record) {
           return Promise.resolve(
             typeof hooks[includeType][1] === 'function' ?
-              hooks[includeType][1](context, record) : record)
+              hooks[includeType][1](ctx, record) : record)
         }))
       }))
 
         .then(function (types) {
           var i, j, k, l
 
-          // Don't need this anymore.
-          delete request.includeType
-
           // Assign results of output hooks on includes.
           for (i = 0, j = types.length; i < j; i++)
             for (k = 0, l = types[i].length; k < l; k++)