The reason for dropping field presence is more of the same with dropping
default values. Basically we want to simplify protobuf and make it easier
to implement efficiently in more languages. We are preparing the proto3
documentation and will share more information about the trade-offs we have
made.
On Fri Jan 16 2015 at 12:17:25 PM V.B. <vidalborro...@gmail.com> wrote:

> 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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