Note that Jeffrey Sarnoff started the JuliaPraxis organisation specifically for discussing topics like this https://github.com/JuliaPraxis
There is a big collaborative document on naming practices https://github.com/JuliaPraxis/Naming with a discussion of underscores and such as well. All the advice there is based on broad discussions on the dedicated gitter channel JuliaPraxis/Naming - Gitter
I am not saying everything there is right, or should be adhered to by people, simply that it is a good place to store and discuss these issues so the outcome of the discussions will also be useful in the future.