*pathname-customary-case*

This variable determines what is the customary case when the :case keyword argument to various pathname functions (listed next) is specified :common. The Common Lisp pathname functions that accept a :case keyword argument are make-pathname, pathname-host, pathname-device, pathname-directory, pathname-name, and pathname-type. (In earlier releases, the :case keyword argument to those functions was simply ignored.)

The initial value of this variable is :lower on all platforms, even Windows. The other allowable value is :upper.

We do not recommend using the :case keyword argument to any of the named pathname functions. If you do not specify a value for the :case keyword argument in the listed functions, Allegro CL behavior is unchanged from previous versions.

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Created 2019.8.20.