Duplicate phone numbers are allowed

[nus-pe-bot]

While two contacts can not have same names, they are allowed to have same phone numbers, which is not likely to happen, and should be captured.

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_{[original: nus-cs2103-AY2324S2/pe-interim#5568] [original labels: severity.Medium type.FeatureFlaw]}

[ziiqii]

Team's Response

In reality, there are people who share the same company phone number.

We wanted to accommodate for this case, and impose fewer restrictions on the user.

Duplicate status (if any):

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