In what sense would safety be such a high priority for a high performance string library? I found this blog post was good at illustrating why undefined...simil

In what sense would safety be such a high priority for a high performance string library? I found this blog post was good at illustrating why undefined...similar to unsafe...operations exist https://nullprogram.com/blog/2018/07/20/ https://nullprogram.com/blog/2018/07/20/