I have zero Unidata authority, but I'd like to state the obvious: Unicode is complicated. This may already account for the somewhat vague formulation in the NUG if one takes a look at [the list of whitespace characters in unicode](https://en.wikipedia.org/wiki/Unicode_character_property#Whitespace). Indeed, whether one wants to go with a blacklist or a whitelist approach, it may be a good idea to think and write in terms of Unicode character categories (cf [here](https://en.wikipedia.org/wiki/Unicode_character_property#General_Category) or [here](https://unicodebook.readthedocs.io/unicode.html#categories)).
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