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Reduce binary size overhead of new-style constructors
The lookup of the `self` type and value pointer are moved out of template code and into `dispatcher`. This brings down the binary size of constructors back to the level of the old placement-new approach. (It also avoids a second lookup for `init_instance`.) With this implementation, mixing old- and new-style constructors in the same overload set may result in some runtime overhead for temporary allocations/deallocations, but this should be fine as old style constructors are phased out.
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