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  19.2 Pathnames   19.2.2 Interpreting Pathname Component Values Strings in Component Values Case in Pathname Components Common Case in Pathname Components

For the functions in Figure Case in Pathname Components, a value of :common for the :case argument that these functions should receive and yield strings in component values according to the following conventions:

  • All uppercase means to use a file system's customary case.
  • All lowercase means to use the opposite of the customary case.
  • Mixed case represents itself.
Note that these conventions have been chosen in such a way that translation from :local to :common and back to :local is information-preserving.

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