Set Azure Webjob to run in 64-bit Mode

I just found out that my Azure Webjob was running 32-bit all the time without me even knowing it. As I tried to attach my debugger on the Webjob I got following error message:
"Unable to attach. The 64-bit version of the Visual Studio Remote Debugger (MSVSMON.EXE) cannot be used to debug 32-bit processes or 32-bit dumps. Please use the 32-bit version instead."

That was a surprise because I was expecting my WebJobs to be running 64-bit, especially as I double checked under my Application Settings in Azure Portal that my Web App IS running in 64-bit Mode. But no. WebJob Executables were acutely built as 32-bit Applications so I looked at my Build Configuration Settings and I found following Checkbox:

I am not sure why this setting is a default for every Azure WebJob. It only might have sense if Azure Team thinks that WebJobs are planned for a small workloads but if you have (as in my case) very large workloads you will see that x64 servers with sufficient CPU and RAM outperform x86 by a healthy measure.

So anyway, if you have huge workloads and process gigabytes of data with your WebJobs, make sure you unselect this Checkbox in your Build Configuration!