That could be fixed with 1 additional concept. Instead of Customer: 1 - 1: Set(D... | Hacker News

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erpellan on Oct 5, 2020 | parent | context | favorite | on: Applying “make invalid states unrepresentable”

That could be fixed with 1 additional concept. Instead of

    Customer: 1 - 1: Set(Dates)

What if it was

    Customer 1 - *: Contract: 1 - 1: Set(Dates)

Overlap achieved.

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