https://github.com/ziglang/zig/pull/4929#issuecomment-649191...
The bulk of the conversation happened in Discord around that time. Initial attempts to bring this up were met with "zig is perfect"-type conversation, none of which was very technical.
Finally, the conversation grew to be so large and fiery that Andrew had to step in and say "everyone play nice, now!" and then head back out.
Then this PR was filed. Invalid user input should not be classed as undefined behavior and concluding that the standard library's UTF decoder shouldn't be used if you want a safe execution is just absurd.
There were a few other run-ins on discord in the same vein. It made a few people at the time leave, including myself.
Andrew's smart. Zig is a cool idea. But I don't like when this laisse-faire attitude is taken when designing a programming language that places so much emphasis on being safe.