184.108.40.206.2.2 Common Case in Pathname Components
For the functions in Figure 19-2, a value of :common for the :case argument that these functions should receive and yield strings in component values according to the following conventions:
Note that these conventions have been chosen in such a way that translation from :local to :common and back to :local is information-preserving.
- * 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.
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