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gawk: Extension Future Growth

 C.5.4 Room For Future Growth
 The API can later be expanded, in two ways:
    * 'gawk' passes an "extension id" into the extension when it first
      loads the extension.  The extension then passes this id back to
      'gawk' with each function call.  This mechanism allows 'gawk' to
      identify the extension calling into it, should it need to know.
    * Similarly, the extension passes a "name space" into 'gawk' when it
      registers each extension function.  This accommodates a possible
      future mechanism for grouping extension functions and possibly
      avoiding name conflicts.
    Of course, as of this writing, no decisions have been made with
 respect to any of the above.
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