Create a new fragment.
The options to create the fragment.
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cryptoThe encryption mode to use.
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seedThe encryption seed.
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selfWhether the fragment should self-destruct after being read.
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serverThe API server to use.
Mainly used by the @not3/ui. As we do not want to send the encryption details to the server, we use this class to store and parse the details from the fragment block of the URL.