MacVim exports standard UTIs, and does it wrongly, messing up the system

Instructions: Replace the template text and remove irrelevant text (including this line)

Describe the bug
MacVim exports standard UTIs, such as com.adobe.postscript. This is wrong, they should be imported, as they are defined by the system. What is worse, the declaration is seriously wrong. It declares the UTI as conforming to to public.plain-text. THIS IS WRONG it should conform to public.data and public.composite-content. This messes up the system seriously. For instance, when an app checks a UTI, it should use conformsTo to do so, and this will match public-plain-text for postscript, breaking the (other!) app. So you are actually sabotaging other apops and the system.

To Reproduce
In an (other!) app, check an UTI (for instance when writing data from a document based cocoa app) against com.adobe.postscript or public.plain-text (if both are supported)

Expected behavior
This should always match com.adobe.postscript when the type is com.adobe.postscript, and should match public.plain-text for public.plain-text.

Actual Behavior
When comparing public.plain-text against com.adobe.postscript, it now matches (conforms to), even if it should not.

Screenshots
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Environment (please complete the following information):

• Vim version [e.g. 8.1.1234] (Or paste the result of vim --version.)
• OS: [e.g. Ubuntu 18.04, Windows 10 1809, macOS 10.14]
• Terminal: [e.g. GNOME Terminal, mintty, iTerm2, tmux, GNU screen] (Use GUI if you use the GUI.)

Additional context
Don't ever sabotage the system.

Das Issue nennt weder eine Datei noch einen Test. Beginne damit, MacVims macOS-UTI-Deklarationen zu finden, und vergleiche, wie Standard-UTIs wie com.adobe.postscript exportiert oder importiert werden. Erledigt ist die Aufgabe, wenn Standard-UTIs nicht fälschlicherweise als konform zu public.plain-text deklariert werden und der gemeldete Konformitätsvergleich nicht mehr übereinstimmt.