In order to make the instance conform to the class C_{{to}}, local slots specified by the class C_{{to}} that are not specified by the class C_{{from}} are added, and local slots not specified by the class C_{{to}} that are specified by the class C_{{from}} are discarded.
The values of local slots specified by both the class C_{{to}} and the class C_{{from}} are retained. If such a local slot was unbound, it remains unbound.
The values of slots specified as shared in the class C_{{from}} and as local in the class C_{{to}} are retained.
This first step of the update does not affect the values of any shared slots.
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