Ruud H.G. van Tol wrote:
> Are all or some of the following equivalent to <sp>?
>   U+00A0  No-Break Space
>   U+202F  Narow No-Break Space 
>   U+FEFF  Zero Width No-Break Space
>   U+2060  Word Joiner

No.  A05 makes it explicit <sp> is just \x20, and S05 also says that it
matches one "space char", which also means U+0020 SPACE, although more

I think S05 can use this clarification diff:

-     / <sp> /                # match a space char
+     / <sp> /                # match the SPACE character (U+0020)


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