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https://issues.apache.org/jira/browse/GROOVY-7914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17782683#comment-17782683
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Eric Milles commented on GROOVY-7914:
-------------------------------------
{{JSONObject}} provides {{isNull(String)}} to test if a key was given with the
null value.
> 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
> Priority: Major
>
> This might be related to 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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