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Thanks for the ping @Aklapper

Adding some more information about the current behavior:

• It's trivial to add a newline in VE at the moment, we do not prevent it in the dialog. Steps to reproduce are simply to edit details and add one or two newlines, which results in a diff like this one:

• Surprisingly, both the legacy and new parsers accept the input and render the newline as a regular space character, despite the newlines appearing in wikitext. This behavior is the same when editing the main reference body! Did Cite ever allow vertical space?
• Also surprisingly, comparing against the HTML spec it seems that an attribute value can contain any text, even newline. This is clear reading the quoted attribute syntax vs. the unquoted syntax: the latter will stop parsing the value after seeing a newline.

So the only consequence seems to be weird UI glitches where the newlines are eaten or turned into special characters, +1 that it can wait until after MVP. Here's an image of what happens when loading a page with newlines in both the main and details: