Provide a brief description of what this PR does, and why it's needed.
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- This PR contains no more than 200 lines of code, excluding test code.
- This PR meets CasperLabs coding standards.
- If this PR adds a new feature, it includes tests related to this feature.
- You assigned one person to review this PR.
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- Do not forget to run
bors r+if GitHub policy is not enforced, e.g. when merging into another feature branch. It may be omitted under some circumstances if this PR intentionally assumes that integration tests will fail but will be fixed with the future PRs.
Optional. Add any notes on caveats, approaches you tried that didn't work, or anything else.