Github user oza commented on the issue:
https://github.com/apache/curator/pull/190
Thanks for taking this big issue. It must be helpful for Curator's users.
Do you think that this change must be done with source-level compatibility? If
the answer is positive, it looks good to me.
> However, this won't be a problem because there's no reason to think that
Guava will change or remove these basic interfaces.
It's realistic decision, especially for Function and Predicate interfaces.
About
[TypeToken](https://google.github.io/guava/releases/snapshot/api/docs/com/google/common/reflect/TypeToken.html),
however, it is marked with [Beta
annotation](https://google.github.io/guava/releases/snapshot/api/docs/com/google/common/annotations/Beta.html).
Hence, I think the interface can be changed.
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