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https://issues.apache.org/jira/browse/GROOVY-7914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15436678#comment-15436678
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Jochen Theodorou commented on GROOVY-7914:
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Are we talking about null==x and x==null in general, or we talking about this
JSONObject.NULL? Because this NULL does not implement a proper equivalence
relation, as it misses symmetry. If we avoid the short path here, we would
still have a difference between null==x and x==null.
> Comparison operator does not delegate to .equals() for null
> -----------------------------------------------------------
>
> Key: GROOVY-7914
> URL: https://issues.apache.org/jira/browse/GROOVY-7914
> Project: Groovy
> Issue Type: Bug
> Reporter: Dario Bertini
>
> This might be related to https://issues.apache.org/jira/browse/GROOVY-4526
> supposedly a PR over there has been merged, but the bug is still flagged as
> open (and indeed, I can locally reproduce it).
> This one instead caused problems when handling org.json.JSONObject
> That type uses its own internal JSONObject.Null class to represent null
> inside json (which is useful to distinguish between keys being missing, and
> values explicitly being set to null)
> it overrides .equals(other) to check if the other object is null, but that
> method is never invoked
> basically:
> JSONObject.NULL == null
> false
> JSONObject.NULL.equals(null)
> true
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