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ANSI Common Lisp  1 Introduction 1.4 Definitions 1.4.4 Interpreting Dictionary Entries
1.4.4.3 The "Arguments and Values" Section of a Dictionary Entry
An English language description of what arguments the operator accepts
and what values it returns, including information about defaults for parameters
corresponding to omittable arguments
(such as optional parameters and keyword parameters).
For special operators and macros,
their arguments are not evaluated unless it is explicitly stated in their
descriptions that they are evaluated.
Except as explicitly specified otherwise,
the consequences are undefined if these type restrictions are violated.
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