[racket] TR: struct: #:prefab option

The below is now failing for me.
(struct: Stuff ([this : String][that : Natural]) #:prefab)

True the TR documentation explicitly enumerates #:transparent and #:mutable
as the only valid struct: options, however, #:prefab did work.  I have a
decent amount of code in some cluster stuff that leverages prefab
structures as an easy and effective serialization mechanism across sockets
and UDP broadcasts.

If there is a typing issue with the use of #:prefab and its banishment
permanent, is there an alternate best practice mechanism for easy struct:
serialization/de-serialization?


Thanks,

Ray
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