Previously: X::Pack forwarded to CreateX.
Now: CreateX will forward to X::Pack.
This is a step toward enabling using native types for tables when using the
object API. When defining a native table, the user will be able to define a
custom X::Pack method (which is more consistent with the existing native_type
functionality for structs). By reversing the order of the dependencies, CreateX
can continue to be auto-generated and will use the custom X::Pack method when
overriden for native_type tables.
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