FYI, Ruby's Pathname class doesn't inherit String. http://ruby-doc.org/stdlib-2.1.0/libdoc/pathname/rdoc/Pathname.html
Ruby has two "convert to string" method. `.to_s` is like `__str__`. `.to_str` is like `__index__` but for str. It is used for implicit conversion. File.open accepts any object implements `.to_str`.
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