diff --git a/.flowconfig b/.flowconfig
index 6d28fce5..3a932b37 100644
--- a/.flowconfig
+++ b/.flowconfig
@@ -6,6 +6,7 @@ decl
 .*/dist/.*
 .*/docs/.*
 .*/scripts/.*
+.*/examples/.*
 .*/node_modules/bcryptjs/*
 
 [options]
diff --git a/appveyor.yml b/appveyor.yml
index 7c6931f8..758c5d56 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -16,10 +16,6 @@ environment:
 services:
   - mysql
 
-cache:
-  - C:\projects\lux\node_modules
-  - C:\projects\lux\test\test-app\node_modules
-
 install:
   - ps: C:\projects\lux\scripts\appveyor\install.ps1
 
diff --git a/package.json b/package.json
index 58431c74..8bceea69 100644
--- a/package.json
+++ b/package.json
@@ -61,7 +61,7 @@
     "documentation": "4.0.0-beta9",
     "eslint-plugin-flowtype": "2.19.0",
     "faker": "3.1.0",
-    "flow-bin": "0.32.0",
+    "flow-bin": "0.33.0",
     "mocha": "3.1.0",
     "node-fetch": "1.6.3",
     "nyc": "8.3.0",
diff --git a/src/packages/jsonapi/interfaces.js b/src/packages/jsonapi/interfaces.js
index 642e6fac..c607c29e 100644
--- a/src/packages/jsonapi/interfaces.js
+++ b/src/packages/jsonapi/interfaces.js
@@ -19,6 +19,7 @@ interface JSONAPI$LinkObject {
 type JSONAPI$Link = ?(string | JSONAPI$LinkObject);
 
 interface JSONAPI$ResourceLinksObject {
+  // $FlowIgnore
   self?: JSONAPI$Link;
   related?: JSONAPI$Link;
 }
@@ -74,7 +75,8 @@ export interface JSONAPI$ErrorObject {
 }
 
 export interface JSONAPI$Document {
-  data?: JSONAPI$ResourceObject | Array<JSONAPI$ResourceObject>;
+  // $FlowIgnore
+  data?: Array<JSONAPI$ResourceObject> | JSONAPI$ResourceObject;
   links?: JSONAPI$DocumentLinks;
   errors?: Array<JSONAPI$ErrorObject>;
   included?: Array<JSONAPI$ResourceObject>;
diff --git a/src/packages/router/route/params/errors/resource-mismatch-error.js b/src/packages/router/route/params/errors/resource-mismatch-error.js
index 35c9ec75..31fb69a2 100644
--- a/src/packages/router/route/params/errors/resource-mismatch-error.js
+++ b/src/packages/router/route/params/errors/resource-mismatch-error.js
@@ -7,9 +7,12 @@ import { createServerError } from '../../../../server';
 class ResourceMismatchError extends TypeError {
   constructor(path: string, expected: mixed, actual: mixed) {
     if (typeof actual === 'string') {
-      actual = `'${actual}'`;
+      actual = `'${String(actual)}'`;
     }
 
+    actual = String(actual);
+    expected = String(expected);
+
     super(`Expected '${expected}' for parameter '${path}' but got ${actual}.`);
   }
 }