Description

They can be initialized directly from iterables in Rust.

Desired behavior/Acceptance criteria (returned value, expected error, performance expectations, etc.)

• find the correct initialization idiom (look for the line marked with this task's ID)

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Completion checklist

• Before closing this task, review one by one the checklist available here: https://www.mediawiki.org/wiki/Abstract_Wikipedia_team/Definition_of_Done#Back-end_Task/Bug_completion_checklist