CLHS: Section 2.1.1.2

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## 2.1.1.2 The Standard Readtable

The standard readtable conforms to standard syntax. The consequences are undefined if an attempt is made to modify the standard readtable. To achieve the effect of altering or extending standard syntax, a copy of the standard readtable can be created; see the function copy-readtable.

The readtable case of the standard readtable is `:upcase`.

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