alt Hacker NewsAnd the day you add a way to batch import request through another code path, you may forget the validation.
Having it in the lower layer is correct, a proper optimizing compiler should be able to detect there's a single code path to the function and that the checks have already been done, skipping the second check.
Well - this would be an example of defensive programming and by that logic catering for this "what if" is the way to go. LLMs were correct all along!