If the goal was to properly reverse Unicode text, this doesn't do that — it completely fails to consider combining characters. Those need to stay in-order… oth

If the goal was to properly reverse Unicode text, this doesn't do that — it completely fails to consider combining characters. Those need to stay in-order… otherwise the combining accent jumps to the next/previous character. Generally speaking, Unicode text can't be reversed without the UCD (Unicode Character Database) at hand. Also, as soon as you consider that arbitrary groups of characters (or "Rune"s) need to stay in-order, you might as well stay on UTF-8 since the variable length encoding no longer really matters. (Also-also, some text just can't be reversed, or might change characters in reverse. For example, Greek Sigma [σ] changes to [ς] if it is at the end of a word. Do you readjust that after flipping a word around?)