Every object in the system can have a property list that may be used for information about that object. For example, a function may have a property list that includes information about the source file in which it is defined.
Property lists are implemented as assq lists (see section Association Lists).
Currently, property lists are implemented differently for procedures and
closures than for other kinds of objects. Therefore, when manipulating
a property list associated with a procedure object, use the
procedure functions; otherwise, use the
[Interface bug: there should be a second level of interface in which the user provides a "property table" that is possibly private.]
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