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https://issues.apache.org/jira/browse/PDFBOX-4669?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17003271#comment-17003271
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Maruan Sahyoun commented on PDFBOX-4669:
----------------------------------------

The last addition  was done to show that using direct objects will work when 
removing objects from {{COSArrayList}}

The same test will fail if trying to remove indirect objects as pointed out in 
above comment from mkl @ stackoverflow

Will work on fixing that. We shall also deprecate the 
\{{COSArrayList.getCOSArray}} method in 2.0 and remove \{{COSArrayList.toList}} 
for 3.0. Getting the underlying {{COSArray}} from {{COSArrayList}} would allow 
for direct manipulation and which will would bring both internal lists out of 
sync. Doing the same by going a different route to get access to the 
{{COSArray}} would have the same effect but this way we at least discourage 
that use.

> Ensure proper functionality of COSArrayList
> -------------------------------------------
>
>                 Key: PDFBOX-4669
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4669
>             Project: PDFBox
>          Issue Type: Sub-task
>          Components: PDModel
>    Affects Versions: 2.0.17, 3.0.0 PDFBox
>            Reporter: Maruan Sahyoun
>            Assignee: Maruan Sahyoun
>            Priority: Major
>
> The current COSArrayList implementation has some glitches as pointed out at 
> https://stackoverflow.com/questions/45812696/
> In addition when working with {{AnnotationFilter}} as the 
> adding/update/removal is index based the wron index of the underlying 
> {{COSArray}} is affected. 



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