Program logic bugs vs input/environmental errors

[Sean Kelly via Digitalmars-d]

On Saturday, 18 October 2014 at 05:10:20 UTC, Walter Bright wrote:
>
> I understand that some have to work with poorly written 
> libraries that incorrectly use assert. If that's the only issue 
> with those libraries, you're probably lucky :-) Short term, I 
> suggest editing the code of those libraries, and pressuring the 
> authors of them. Longer term, we need to establish a culture of 
> using assert/enforce correctly.

So you consider the library interface to be user input?  What 
about calls that are used internally but also exposed as part of 
the library interface?