So your first answer to being told your initial suggestion is insufficient for bounds-checking was to share a godbolt link without elaborating on where the checking was actually coming from; and when I elaborate, for other readers' sake, not yours, on your solution and other comparable ones, you get defensive and repeatedly call me pedant. Ok, but you know, these discussion are for everyone else to read and maybe learn something too, not just us.

As for the bounds-checked accessors, I mentioned them because they already exist in current C++ for other collections, they're coming to the one you suggested using, and I thought them relevant to a discussion about C++ lacking spatial safety.