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https://issues.apache.org/jira/browse/LUCENE-6317?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14342231#comment-14342231
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Robert Muir commented on LUCENE-6317:
-------------------------------------
I think we should deprecate the current readStringStringMap/readStringSet and
define new ones that:
* write the size as vint (int is stupid here)
* always return immutable maps/sets. this just matches how lucene works.
> Fix readStringStringMap api
> ---------------------------
>
> Key: LUCENE-6317
> URL: https://issues.apache.org/jira/browse/LUCENE-6317
> Project: Lucene - Core
> Issue Type: Sub-task
> Reporter: Robert Muir
> Fix For: Trunk, 5.1
>
>
> Currently this api is not very efficient, and always returns a mutable map.
> Can we change it to allow immutability? its sad we don't return
> Collections.emptyMap so its the same instance for all empty cases.
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