Do not call jl_set_typeof on initialized value. #16261
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This is one of the most unsafe thing one can do to the GC. (Yes, in this case the type layout is compatible and the value isn't visible to the GC yet but this usage can easily break due to minor changes in the code....)
Ref b3cc1a4#diff-4487cf24854d3caa595fc78061793550R235 luckily this is not necessary anymore..