Analysis of information sources in references of the Wikipedia article "UTF-32" in English language version.
Clause 9.4: "Because surrogate code points are not UCS scalar values, UTF-32 code units in the range 0000 D800-0000 DFFF are ill-formed". Clause 4.57: "[UCS codespace] consisting of the integers from 0 to 10 FFFF (hexadecimal)". Clause 4.58: "[UCS scalar value] any UCS code point except high-surrogate and low-surrogate code points".
Folks start implying that code points mean something, and that O(1) indexing or slicing at code point boundaries is a useful operation.
It [UCS-4] is now treated simply as a synonym for UTF-32, and is considered the canonical form for representation of characters in 10646.
