valerybokov commented on pull request #107:
URL: https://github.com/apache/pdfbox/pull/107#issuecomment-827584201


   Hi, @THausherr! I researched the PDFCloneUtility code and found one detail. 
This class has two fields as collections (cloneVersion and clonedValues). I 
understood these collections never clears. Is all their content really needed 
for clonning or you can clear some items for specific level of stack or before 
some method, or after getting an item from collection?


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