That's exactly what's happening. Not all providers do, a lot will. See also 2048 bit DKIM Public Key records. They have to be TXT records but are always going to be >255 characters.
Makes sense. I'm used to DNS providers being shite so I didn't expect something actually useful to be happening.
@hippy started
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That's exactly what's happening. Not all providers do, a lot will. See also 2048 bit DKIM Public Key records. They have to be TXT records but are always going to be >255 characters.