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| 19.2 Pathnames 19.2.2 Interpreting Pathname Component Values 19.2.2.1 Strings in Component Values 19.2.2.1.2 Case in Pathname Components ### 19.2.2.1.2.2 Common Case in Pathname Components For the functions in Figure 19.2.2.1.2 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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