Notes about the Pathname Version Component (ANSI and GNU Common Lisp Document)

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#### 19.2.2.20 Notes about the Pathname Version Component

It is suggested, but not required, that implementations do the following:

`*`

  Use positive integers starting at 1 as version numbers.

`*`

  Recognize the symbol `:oldest` to designate the smallest existing version number.

`*`

  Use keywords for other special versions.