Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/10554#issuecomment-168807831
Yeah that's a good point -- let me see if I can understand that better. At
some level, it has to be an `Object` and not a `long` in order to be part of a
`java.util.Map`, so something is transforming something. It may be that
implicits convert it to a `java.lang.Long` in the end, maybe via `RichLong`,
which would be pretty good news -- this is just then fixing the signature and
making explicit some implicit conversion and maybe even making it more
efficient. Let me experiment a bit
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