Add check for duplicate keys.

tomasmcguinness / dotnet-passbook

A .Net Library for generating Apple Passbook (Wallet) files for iOS. Please get involved by creating pull requests and opening issues!

MIT License

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Closed tomasmcguinness closed 2 years ago

tomasmcguinness commented 2 years ago

When a field is being added, the other collections of fields are now checked for duplicates.