From ccab332079305972c91932ae3a70e69ea670a72c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Enrique=20Garc=C3=ADa=20Cota?= <kikito@gmail.com>
Date: Wed, 7 Mar 2018 09:27:56 -0800
Subject: [PATCH] isInstanceOf works on primitives.

Fixes #55
---
 middleclass.lua               |  7 ++++++-
 spec/default_methods_spec.lua | 22 ++++++++++++++++------
 2 files changed, 22 insertions(+), 7 deletions(-)

diff --git a/middleclass.lua b/middleclass.lua
index b118f17..de72d49 100644
--- a/middleclass.lua
+++ b/middleclass.lua
@@ -119,7 +119,12 @@ local DefaultMixin = {
   initialize   = function(self, ...) end,
 
   isInstanceOf = function(self, aClass)
-    return type(aClass) == 'table' and (aClass == self.class or self.class:isSubclassOf(aClass))
+    return type(aClass) == 'table'
+       and type(self) == 'table'
+       and (self.class == aClass
+            or type(self.class) == 'table'
+            and type(self.class.isSubclassOf) == 'function'
+            and self.class:isSubclassOf(aClass))
   end,
 
   static = {
diff --git a/spec/default_methods_spec.lua b/spec/default_methods_spec.lua
index d9a27c6..91fd9b8 100644
--- a/spec/default_methods_spec.lua
+++ b/spec/default_methods_spec.lua
@@ -125,14 +125,24 @@ describe('Default methods', function()
         local o = Object:new()
         local primitives = {nil, 1, 'hello', {}, function() end, Object:new()}
 
-        for _,primitive in pairs(primitives) do
-          local theType = type(primitive)
-          describe('A ' .. theType, function()
+        describe('used as classes', function()
+          for _,primitive in pairs(primitives) do
+            local theType = type(primitive)
             it('object:isInstanceOf(, '.. theType ..') returns false', function()
-              assert.is_false(o:isInstanceOf(primitive))
+              assert.is_falsy(o:isInstanceOf(primitive))
             end)
-          end)
-        end
+          end
+        end)
+
+        describe('used as instances', function()
+          for _,primitive in pairs(primitives) do
+            local theType = type(primitive)
+            it('Object.isInstanceOf('.. theType ..', Object) returns false without error', function()
+              assert.is_falsy(Object.isInstanceOf(primitive, Object))
+            end)
+          end
+        end)
+
 
       end)