[danielheath]

I don't want my app to change performance-sensitive behavior at runtime, that's a debugging nightmare.

I do want my framework to throw an error in development mode if I screw up the preloading.

[wruza]

Since this also requires the same heuristics, it could be just an option: orm.unroll(“auto|throw|none”). Would suit you, me and a commenter who wants hundreds of requests as they wrote.