[This is a question inspired by a recent discussion elsewhere, and I'll provide an answer right with it.]
I was wondering about the odd C phenomenon of arrays "decaying" to pointers, e.g. when used as function arguments. That just seems so unsafe. It is also inconvenient to pass the length explicitly with it. And I can pass the other type of aggregate -- structs -- perfectly well by value; structs do not decay.
What is the rationale behind this design decision? How does it integrate with the language? Why is there a difference to structs?