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><P
>  <ACRONYM
CLASS="ACRONYM"
>GIN</ACRONYM
> assumes that indexable operators are strict.  This
  means that <CODE
CLASS="FUNCTION"
>extractValue</CODE
> will not be called at all on a NULL
  item value (instead, a placeholder index entry is created automatically),
  and <CODE
CLASS="FUNCTION"
>extractQuery</CODE
> will not be called on a NULL query
  value either (instead, the query is presumed to be unsatisfiable).  Note
  however that NULL key values contained within a non-null composite item
  or query value are supported.
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