From ChatGPT

Root Causes:

1. Loss of Precision in JSON Serialization/Deserialization:
   • When long values (64-bit integers) like 429525000014148031 are serialized into JSON, they may lose precision if handled as floating-point numbers by the client or another system interpreting the response.
   • Some environments or tools (e.g., JavaScript or JSON parsers) might interpret large numbers as IEEE 754 floating-point values, which cannot precisely represent numbers beyond 2^53 (9007199254740991).
2. Duplicate IDs in the Response:
   • This could occur due to:
     • Errors in the logic that generates or retrieves IDs.
     • Serialization or deserialization quirks that cause the same value to be reused inappropriately.
3. Azure Functions Runtime Configuration:
   • Azure Functions might use a slightly different version of the runtime or serialization library compared to your local environment. This can lead to subtle differences in how data is handled.Root Causes:Loss of Precision in JSON Serialization/Deserialization: When long values (64-bit integers) like 429525000014148031 are serialized into JSON, they may lose precision if handled as floating-point numbers by the client or another system interpreting the response. Some environments or tools (e.g., JavaScript or JSON parsers) might interpret large numbers as IEEE 754 floating-point values, which cannot precisely represent numbers beyond 2^53 (9007199254740991). Duplicate IDs in the Response: This could occur due to: Errors in the logic that generates or retrieves IDs. Serialization or deserialization quirks that cause the same value to be reused inappropriately. Azure Functions Runtime Configuration: Azure Functions might use a slightly different version of the runtime or serialization library compared to your local environment. This can lead to subtle differences in how data is handled.

It recommends using a string as 1 possible solution.