DD XY: Template
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Summary
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Motivation
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Requirements
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Proposed Solution
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Definition of Done
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(Only applicable to design documents that describe a new feature.  While the
DoD is not satisfied yet, a user-facing feature **must** be behind a feature
flag or dev-mode flag.)

Alternatives
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Drawbacks
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Discussion / Q&A
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(This should be filled in with results from discussions on mailing lists / personal communication.)