14  Interaction between _parc() and _storc()
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     _parc() examines the VALUE associated with a parameter and returns
     a pointer to the data referred to by that VALUE.  _storc() creates
     a new VALUE and copies it to a specified location (variable, array
     element, or Eval Stack entry).  Thus _storc() affects the pointer
     returned by _parc().  After a _storc(), the pointer returned by
     _parc() will point to the new data created by the _storc().  You
     can take advantage of this to avoid allocating fixed buffers and
     making temporary copies of string values.