Add insert_at and insert_at_slot API #30
Merged
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This PR adds
insert_at(&mut self, Index, T) -> Option<T>
andinsert_at_slot(&mut self, u32, T) -> (Index, Option<T>)
methods; these are useful for manipulating the arena by-slot and doing deserialization or other circumstances in which we need to "resurrect" a previous or future index.