Can I ask for more details about why presence logic was removed (e.g. 
hasFoo() ) for primitives? This has been a very useful feature for us.

      1. Removal of field presence logic for primitive value fields, removal
>          of required fields, and removal of default values. This makes 
> proto3
>          significantly easier to implement with open struct 
> representations,
>          as in languages like Android Java, Objective C, or Go.

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