Use IdentityMap instead of CuckooObjectMap in class resolver #877
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…efault loadFactor to 0.7
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Performance optimizations in #876 allow us to finally get rid of
CuckooObjectMap.The map was carried over from Kryo 4 because it had clear performance advantages in some read-mostly scenarios. The improved
IdentityMapfrom #876 now outperforms it by about 3-5%.IdentityMapinDefaultClassResolverand deprecateCuckooObjectMap