Why does the spelling (capitalization) of decomposition types differ in DerivedDecompositionType.txt from UnicodeData.txt?

[Markus Scherer]

On Thu, Feb 20, 2025 at 8:59 AM Peter Constable via Unicode <
unicode at corp.unicode.org> wrote:

> PropertyValueAliases.txt has this entry:
>
> dt ; Nb                               ; Nobreak                          ;
> nb
>
> What doesn't seem clear from UAX #44 is whether an alias could be added
> that is equivalent under name matching rules to an existing alias.
>

It seems like that's allowed, but what would be the point?
markus
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