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https://issues.apache.org/jira/browse/PDFBOX-4669?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17003626#comment-17003626
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Maruan Sahyoun commented on PDFBOX-4669:
----------------------------------------

OK - for now I'd do
 * equals by comparing the dictionaries - which would ensure that we don't keep 
nested structures in memory and also fail early
 * hashCode by using the hasCode of the underlying Map which should be as safe 
as the current default calculation.

> 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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