Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/10554#issuecomment-168821601
@rxin so I tried unpacking this code in IntelliJ:
```
val m = new java.util.HashMap[String, java.lang.Long]()
val l = 1L
m.put("foo", l)
```
... and it tells me that the implicit conversion that is applied here is
`Predef.long2Long`:
```
implicit def long2Long(x: Long) = java.lang.Long.valueOf(x)
```
It looks like this is the same underlying transformation that happens in
`SerializableMapWrapper` and `mapAsSerializableJavaMap` already. So it looks to
me like this is already the implicit transformation being applied anyway.
Right now the returned type of these methods in Java is `Map<K, Object>`
and the wrapper does the conversion on the fly in `get()`. I believe. I think
to make it a real `Map<K, Long>` requires making the transformation upfront --
well, short of making some other new special purpose wrapper.
WDYT?
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