Defer save with null id

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What steps will reproduce the problem?
class MyEntity {
  @Id Long autogeneratedId;
}
ofy().defer().save().entity(new MyEntity())

What is the expected output? What do you see instead?
java.lang.IllegalArgumentException: You cannot create a Key for an object with 
a null @Id. Object was simonton.gae.LogBasedCounter$LogCounterEntry@843316
    at com.googlecode.objectify.impl.KeyMetadata.getRawKey(KeyMetadata.java:185)
    at com.googlecode.objectify.impl.Keys.rawKeyOf(Keys.java:35)
    at com.googlecode.objectify.impl.Keys.keyOf(Keys.java:28)
    at com.googlecode.objectify.impl.ObjectifyImpl.deferSave(ObjectifyImpl.java:314)
    at com.googlecode.objectify.impl.DeferredSaverImpl.entity(DeferredSaverImpl.java:23)

What version of the product are you using? On what operating system?
5.1.1 on Windows 8.1

Please provide any additional information below.
I am not finding any documentation that deferred saves are not available for 
entities with an auto-generated id.  I think it should either be modified to be 
possible, or documented as forbidden.

Original issue reported on code.google.com by ersim...@gmail.com on 14 Nov 2014 at 10:41

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Original comment by lhori...@gmail.com on 18 Nov 2014 at 8:01

• Changed state: Accepted

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This issue was closed by revision 6b27f1a1e480.

Original comment by lhori...@gmail.com on 18 Nov 2014 at 5:44

• Changed state: Fixed

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Good catch. This has been fixed in master and will make its way out in the next 
release of Objectify.

Original comment by lhori...@gmail.com on 18 Nov 2014 at 5:45

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Jeff this fix alone deserves a separate release.

Original comment by hus...@gmail.com on 27 Nov 2014 at 1:30

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There ya go, 5.1.2 is on way to maven central

Original comment by lhori...@gmail.com on 27 Nov 2014 at 7:07