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It's not clear to me what argument the example is supporting.

The Go code is very concise and the Java code is very verbose.

The Go code does look more efficient but what is ImpressionData? Where is it checking the string is valid utf8?

Why would you send a string which is not valid utf8 over the wire in your system? That's the kind of validation that should probably be done prior to that. Or if it hasn't, you can do the validation manually on the receiver. There's no reason to incur the cost on each transmission.

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