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https://issues.apache.org/jira/browse/OAK-781?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13634007#comment-13634007
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Michael Dürig commented on OAK-781:
-----------------------------------

At revision 1468890 I added another test case that demonstrates the main issue 
here: Modifying node {{c}} in a hierarchy {{/a/b/c}} with {{b.exists() == 
false}} results in the original node {{c}} being overlaid by a new node {{c}}. 
That new node is missing all the original items that where present on the 
original version of {{c}}.
                
> Clarify / fix effects of MISSING_NODE as base state of NodeBuilder
> ------------------------------------------------------------------
>
>                 Key: OAK-781
>                 URL: https://issues.apache.org/jira/browse/OAK-781
>             Project: Jackrabbit Oak
>          Issue Type: Bug
>          Components: core
>            Reporter: Michael Dürig
>
> Having a {{MISSING_NODE}} respectively a node state that returns false for 
> its {{exists}} method as a base state of a node builder results in undefined 
> behaviour. We need to clarify how to handle such cases for resolving OAK-766.

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