 literal.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>owner</CODE> - The owner of the expression, to which the expression can 
              be reset if rewriting takes place.<DD><CODE>num</CODE> - The number literal object.<DT><B>Returns:</B><DD>true if the sub expressions should be traversed.</DL>
</DD>
</DL>
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