remove Callable execution during msgpack serialization

[isopov]

Callable are intended for executing something in separate thread(s) - simply executing them in the same thread during serialization is really misleading

[dmitry-grytsovets]

Remove without workaround? Also your could check the docs here https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/Callable.html

The Callable interface is similar to Runnable, in that both are designed for classes whose instances are POTENTIALLY executed by another thread.

[isopov]

Workaround is pretty clear - first execute Callable and then invoke MsgPackLite.pack() on the result.

[dmitry-grytsovets]

This is not workaround for asynchronous case.

How this code could disturb you?

[isopov]

There is no asynchronous case in the code I suggest to remove and thus no asynchronous workaround is needed.

This code violates single responsibility principle (mixing serialization and execution) and hence the disturbance.

[dmitry-grytsovets]

In some cases, you could do more with this ability.
You could simple not use this opportunity.

[dmitry-grytsovets]

U could see that enum Key use Callable interface to provide id. Did u test code after PR?

[isopov]

OK, got it - 2962aa8 here are the tests