Critical warnings should only be used to indicate programmer error. By default, they are "soft assertions" that allow program execution to continue even though we know the process is no longer operating correctly because a bug has occurred. This is a bad default. Let's crash instead, to make it easier to debug the problem, encourage bug reports, and downgrade any code execution issues into denial of service. We cannot make this decision for applications that use WebKit, but we can do it for MiniBrowser.
Pull request: https://github.com/WebKit/WebKit/pull/28652