CLHS: Section 19.2.1.6

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## 19.2.1.6 The Pathname Version Component

Corresponds to the ``version number'' concept in many host file systems.

The version is either a positive integer or a symbol from the following list: nil, `:wild`, `:unspecific`, or `:newest` (refers to the largest version number that already exists in the file system when reading a file, or to a version number greater than any already existing in the file system when writing a new file). Implementations can define other special version symbols.

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