How to expand "../" in a path?

[Walt Mankowski <waltman@pobox.com>]

Does anyone know of a module to strip out "../" in a path in an
intelligent way?  For example, given the following tree:

a/
  foo
  b/
    c/
      bar
      baz
    d/

I'd like "d/../c/bar" to expand to "/a/b/c/bar" and "d/../../foo" to
expand to "a/foo".

File::Spec->rel2abs almost does this, but it doesn't handle ".."

Walt

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