"The case-sensitive variant of APFS is both normalization-preserving and normalization-sensitive."

It should just always be form-preserving and form-INsensitive.

There is absolutely no reason to want the combination they give. It makes me suspect that they didn't bother separating case- and form-insensitivity, although I can't imagine why one wouldn't. It seems like.. a mistake. Someone misunderstood.