Docs: explain the use of extend in configuration

[RDeluxe]

Subject

Presets

Description

After struggling a while to understand why my preset was completely overriding the base one (even after installing panda base preset then adding it to the array) I realised that I had forgot the keyword extend in my config.

I don't think this is explained anywhere, but as far as I understand without this keyword there is not smart merging. I think it deserves more explanation in the doc.

Thanks!

[astahmer]

good point
also, would it help having a warning message if NOT using the extend keyword ?

[RDeluxe]

Not sure. I think it could be a valid pattern in some case, but not in most, that's true.

But take my pov with a grain of salt, as I'm not 100% sure I understand all the moving parts in Panda yet.