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The schema.Type objects don't have a `Kind() ReprKind` method.  That
was just a bad idea.  I didn't try to fix it; I just nuked it.

The new schema.Type.Kind() method docs include a description of why
it's incorrect to wish for a either a single or a statically known
ReprKind for a type.

(Context mention: the previous commit was also a wind-up for this.
And technically, I'm still winding back up the mental stack here:
this had to get straightened out because I wanted to start poking
codegen for structs; and then I had beef with the TypeStruct.tupleStyle
field being a bool; and then fixing that pointed out that the current
Type.ReprKind methods were kinda insane... yaks!)