It is essentially the same, sure. We have some specialized in-house structs-of-arrays things for doing bulk geometry operations that (behind the scenes) go through `withUnsafeMutableBufferPointer` (etc.) for everything; we keep the code idiomatic, mutation only happens in methods that are marked as mutating, COW still works, and so on.

Thus we hadn't even considered just exposing the pointer and doing it C-style, whence the question as to whether you'd benchmarked the difference between the two.

The abstractions thing is hard, here, the key seems to be defining the bulk operations in terms of pointers (or Swift's "buffer pointers"), essentially what you have in your methods like `SupportsBasicMath.add` and so on. Abstraction is possible here by moving each "type signature"--destination & 1 source? destination & 2 sources? etc.--into "operation protocols", and then having fewer methods but a ton of "operation protocol implementations". Perhaps "more abstraction", definitely not concise. Very dependent on the compiler and inlining, too.

It's a good writeup nonetheless, was just asking a narrow question.