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https://issues.apache.org/jira/browse/SOLR-12959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16675739#comment-16675739
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Andrzej Bialecki  commented on SOLR-12959:
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bq. The json.nl influences how named lists are output

Right, but there's also the default behavior that would be different with this 
change.

bq. I've always wondered why they didn't just implement Map
AFAIK originally they were meant as a memory optimization as compared to Java 
collections, and strictly speaking they should implement a MultiMap but that 
was rejected because it's not a core Java API. Duplicate keys are allowed in 
order to represent more conveniently multi-valued mappings, without actually 
introducing a proper MultiMap and without requiring users to deal with value 
arrays (or lists)

> Deprecate solrj SimpleOrderedMap
> --------------------------------
>
>                 Key: SOLR-12959
>                 URL: https://issues.apache.org/jira/browse/SOLR-12959
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: SolrJ
>            Reporter: Noble Paul
>            Priority: Minor
>
> There is no difference between a NamedList and a  SumpleOrderedMap. It 
> doesn't help to have both of them when they are doing exactly free same things



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