File.expand_path does not work as expected
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                 Key: JRUBY-1606
                 URL: http://jira.codehaus.org/browse/JRUBY-1606
             Project: JRuby
          Issue Type: Bug
    Affects Versions: JRuby 1.1b1
         Environment: Mac OS X 10.4.10 
ruby 1.8.6 (2007-03-13 patchlevel 0) [i686-darwin8.10.1]
            Reporter: Simon Chiang
            Assignee: Thomas E Enebo
            Priority: Minor


File.expand_path does not work in JRuby as in Ruby for filepaths like "/./dir". 
 This can most easily be seen in irb vs jirb:

>irb
irb(main):001:0> File.expand_path("/./dir")
=> "/dir"

>jirb
irb(main):001:0> File.expand_path("/./dir")
=> "//dir"

I got confused trying to make a patch or test case... but here's what the test 
would look like:

def test_expand_path_for_paths_beginning_with_forward_slash
  assert_equal("/dir", File.expand_path("/./dir"))
end

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