CLHS: Section 19.2.2.1.2.2

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## 19.2.2.1.2.2 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:

* 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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