constant-value

Arguments: form &optional environment

Returns form if form does not represent a constant a la constantp (with identical arguments), otherwise returns the value that form should constantly represent. Macroexpansions are performed. If environment is given, all lookups are done per the given environment, otherwise constant-ness is determined by the global environment(s).

See environments.htm for more information on environments.

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Created 2015.5.21.