diff --git a/lib/rhino/ruby_function.rb b/lib/rhino/ruby_function.rb
index 3be1147..49d7f68 100644
--- a/lib/rhino/ruby_function.rb
+++ b/lib/rhino/ruby_function.rb
@@ -8,7 +8,7 @@ module Rhino
     end
     
     def call(cxt, scope, this, args)
-      To.javascript @callable.call(*args.map {|a| To.ruby(a)})
+      To.javascript @callable.call(*Array(args).map {|a| To.ruby(a)})
     end
   end
 end
\ No newline at end of file
diff --git a/lib/rhino/ruby_object.rb b/lib/rhino/ruby_object.rb
index 9483325..6767f61 100644
--- a/lib/rhino/ruby_object.rb
+++ b/lib/rhino/ruby_object.rb
@@ -47,8 +47,8 @@ module Rhino
         if name == "toString"
           return RubyFunction.new(lambda { "[Ruby #{robject.class.name}]"})
         end
-        rb_name = name.gsub(/([a-z])([A-Z])/) {"#{$1}_#{$2.downcase}"}
-        if (robject.public_methods(false).include?(rb_name))
+        rb_name = name.gsub(/([a-z])([A-Z])/) {"#{$1}_#{$2.downcase}"}.to_sym
+        if (robject.public_methods(false).collect(&:to_sym).include?(rb_name))
           method = robject.method(rb_name)
           if method.arity == 0
             To.javascript(method.call)
@@ -61,12 +61,11 @@ module Rhino
       end
 
       def has(name, start)
-        rb_name = name.gsub(/([a-z])([A-Z])/) {"#{$1}_#{$2.downcase}"}
-        To.ruby(start).public_methods(false).respond_to?(rb_name) ? true : super(name,start)
+        rb_name = name.gsub(/([a-z])([A-Z])/) {"#{$1}_#{$2.downcase}"}.to_sym
+        To.ruby(start).public_methods(false).collect(&:to_sym).include?(rb_name) ? true : super(name,start)
       end
 
       Generic = new
-
     end
   end
 end
diff --git a/spec/rhino/context_spec.rb b/spec/rhino/context_spec.rb
index 5d73957..0f6f406 100644
--- a/spec/rhino/context_spec.rb
+++ b/spec/rhino/context_spec.rb
@@ -25,6 +25,15 @@ describe Rhino::Context do
       end
     end
     
+    it "allows you to scope the context to an object" do
+      class MyScope
+        def foo; proc { 'bar' }; end
+      end
+      Context.open(:with => MyScope.new) do |ctx|
+        ctx.eval("foo()").should == 'bar'
+      end
+    end
+    
     it "allows you to seal the standard objects so that they cannot be modified" do
       Context.open(:sealed => true) do |cxt|
         lambda {