Bug #895: MiniTest::Assertions#refute_instance_of should use Object#instance_of? instead Module#===
http://redmine.ruby-lang.org/issues/show/895

Author: okkez _
Status: Open, Priority: Normal
Category: lib

see [ruby-dev:37458], r20798 and r20800

Fixnum === 1 # => true
Numeric === 1 # => true
1.kind_of?(Fixnum) # => true
1.kind_of?(Numeric) # => true
1.instance_of?(Fixnum) # => true
1.instance_of?(Numeric) # => false


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