Weak pointer objects are members of ListsFamily and the categories IsList
and IsMutable. Methods based on the low-level functions in the previous
section, are installed for the list access operations, enabling them to be
used as lists. However, it is not recommended that these be used in
programming. They are supplied mainly as a convenience for interactive
working, and may not be safe, since functions and methods for lists may
assume that after IsBound(w[i]) returns true, access to w[i] is safe.
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GAP 4 manual