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Type Option.as_ref, borrow indexed slice items, type enum_variant payloads - #28
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Gaps found while writing kiwi_codec's generator in plain Elixir:
option.as_ref()synthesizesOption<&T>, also through&Option<T>.index(slice, i)keeps the item's metadata, soindex(fields, i).kindborrows where a reference is expected.let x = index(slice, i)of an item that is notCopyborrows it (&slice[i]) instead of moving out of the index.enum_variant(Enum, :tag, value)patterns are typed, so a copy payload bound through a reference is dereferenced when passed by value.Term.cached_struct_keystakes its keys asR.slice(R.str()), so a plain list literal is borrowed as a slice.