unless the memory it points to is pinned with [runtime.Pinner] and the
Pinner is not unpinned while the Go pointer is stored in C memory.
This implies that C code may not keep a copy of a string, slice,
channel, and so forth, because they cannot be pinned with
[runtime.Pinner].

The _GoString_ type also may not be pinned with [runtime.Pinner].
Because it includes a Go pointer, the memory it points to is only pinned

	}
	type mapType struct {
		CommonType
		Key  typeId
		Elem typeId
	}
	type gobEncoderType struct {
		CommonType
	}

If there are nested type ids, the types for all inner type ids must be defined
before the top-level type id is used to describe an encoded-v.

For simplicity in setup, the connection is defined to understand these types a