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Why is generic of a return type erased when there is an unchecked conversion of a method parameter in Java 8?

• Why is generic of a return type erased when there is an unchecked conversion of a method parameter in Java 8?

Collection http://fastutil.di.unimi.it/ http://pcollections.org/ https://github.com/hrldcpr/pcollections

https://mvnrepository.com/artifact/org.eclipse.collections/eclipse-collections https://github.com/eclipse/eclipse-collections

http://java-performance.info/hashmap-overview-jdk-fastutil-goldman-sachs-hppc-koloboke-trove-january-2015/

https://mvnrepository.com/open-source/collections

<dependency>
    <groupId>com.carrotsearch</groupId>
    <artifactId>hppc</artifactId>
    <version>0.8.1</version>
</dependency>

https://github.com/carrotsearch/hppc

Proxy performance

https://stackoverflow.com/q/1856242/1870054