If set true, then the Java code generator will generate equals() and hashCode() methods for all messages defined in the .proto file. This increases generated code size, potentially substantially for large protos, which may harm a memory-constrained application. - In the full runtime this is a speed optimization, as the AbstractMessage base class includes reflection-based implementations of these methods. - In the lite runtime, setting this option changes the semantics of equals() and hashCode() to more closely match those of the full runtime; the generated methods compute their results based on field values rather than object identity. (Implementations should not assume that hashcodes will be consistent across runtimes or versions of the protocol compiler.)

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