More concrete return types for some database functions

[devnix]

I'm not 100% sure about how hard can we trust on this, but I don't find a case where those arrays should ever be empty.

This suggestion is related to doctrine/dbal#6287

[devnix]

I have a couple of questions. Changing the return of SQLite3Result::fetchArray() to a conditional one depending on the mode parameter would be considered a breaking change and should be on bleeding edge? Should we propose all these changes to bleeding edge?

[ondrejmirtes]

Changing the return

I don't think that's a BC break. It's simply improving the analysis to be more precise.

[ondrejmirtes]

Thank you.