[twodave]

Hard disagree. If my users are exploiting some unintended, unannounced part of my API then me patching that out is something they’re just going to have to deal with. In well-described systems these sorts of behaviors lead to nasty bugs down the line, sometimes months in the future (e.g. “Huh, why aren’t my tax reports tying out?”).

[partdavid]

I think you're agreeing with GP, not disagreeing.

[twodave]

I was disagreeing with the notion that this law has to be taken into account. I suppose that’s true for certain software, but if e.g. Apple can get away with breaking these use cases then I don’t see why, as an API designer, I should care either.

[bryanrasmussen]

I think this really depends on who your customers are and how they pay for your services.