Improve robustness of request construction #600
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This was referenced Jul 18, 2024
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Fixes #507
This PR aims to reduce the likelihood that the user provided request options will be clobbered or ignored as a result of how we construct requests. Copying requests is necessary in some cases, but it's risky as the API is error-prone and so it is best avoided when possible.
Additionally, this PR fixes the root cause of flakiness in the retry tests and re-enables concurrent tests. The performance observers used previously were returning bogus data. Somehow they were caching measurements and returning identical measurement data between completely separate tests and observer instances. Really bizarre. Luckily, we can achieve exactly the same thing and more reliably with even simpler code by just comparing two calls to
performance.now()!