>>>>> On Sun, 14 Jul 2019, Robin H Johnson wrote:

> Demographics, all optional:
> - Where are you located: [textfield, ISO country code]
> - Age bracket [0-17, 18-25, 25-35, 35-45, 45-55, 55-65, 65+]

The combination of these two will in many cases allow to uniquely
identify the developer. There are countries with only one dev, and
there won't be many persons in the low and high age brackets.

These questions are optional of course, but then again, they won't be
of any help if nobody will choose to answer them because of the above.

Ulrich