Deduplicate in-flight async requests
Implement a helper that reuses the same promise for identical in-flight requests and starts a new request only after settlement.
Example:
Input: value = 42
Output: 42
Write a clean implementation and validate it with the provided test cases.
Examples:
Input 1:
{"value":1}Output 1:
1Input 2:
{"value":42}Output 2:
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