Make ReadableStream (WIP) implementation pass WPT test suite

[oleiade]

As we have a starting ReadableStream implementation, we aim to pass the relevant Web Platform Test suite's relevant tests.

Tasks

Preview Give feedback

1. Pass bad-strategies.any.js
2. Pass bad-underlying-sources.any.js
3. Pass cancel.any.js
4. Pass constructor.any.js
5. Pass count-queuing-strategy-integration.any.js
6. Pass default-reader.any.js
7. Pass floating-point-total-queue-size.any.js
8. Pass general.any.js
9. Pass patched-global.any.js
10. Pass reentrant-strategies.any.js
11. Pass tee.any.js
12. Pass templated.any.js

[joanlopez]

Status update (17/04)

• General: 25 out of 38 pass
• Patched global: Should we discard it?
• Reentrant strategies: 3 fail => 1 (tee), 1 (pipeTo), 1 (flaky)
• Tee: Should we discard it?

All the other test suites (bad strategies, bad underlying sources, cancel, ..., templated) work as expected! 🎉

Other stuff pending: revisit ReadableByteStreams?

Edit (17/04 EOD):
General: 32 out of 38 pass

[oleiade]

In the context of this specific issue, we agreed to dismiss the patched-global test suite as we judge it irrelevant to our use case, and we decide to explicitly not implement and test the tee feature of streams.