Java Proto lite: avoid boxing Integers accessing enum lists #16607
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Java Proto lite: avoid boxing Integers accessing enum lists
Provide a specialization for ListAdapter that avoids boxing ints into Integers.
Use this for repeated enum accessors.
In practice, the ints for most enums will fit into the JDK's "boxed int cache", avoiding extra allocations. For large enum numbers, they won't fit, and would allocate. Removing the boxing should also slightly speed up code.