That's actually not possible. We provide 2 keys, a private one and a public one. Lambdas could only be edited using the private key. The public key, which you're supposed to be using in production, allows you to only execute the (already deployed) function.

Was this explanation good? I will add it to the landing page in case someone had the same question.

Since I don't have any Apple devices, if you've got any free time, I'd really appreciate a screenshot to see the issue. Thanks!