reactor/reactor-core v3.2.0.RC1 on GitHub

This is the 5th pre-release (first release candidate) of Reactor 3.2, part of Californium-RC1 Release Train.

⚠️ Update considerations and deprecations

Replace String.replaceAll with a static Pattern and Matcher.replaceAll in Scannable (#1315)
Added a way to strictly limit the rate of requests with limitRate(n, 0) (#1317)
- previously the lowTide and highTide parameter could still be changed by internal prefetching strategies
- now with a lowTide of 0, the requests will strictly adhere to highTide
Blocking code detection and rejection has been improved for toStream() and toIterable(), and now only reject when the iteration is performed (#1313)
- it would previously reject right where the Iterable was materialized, but what actually blocks is the act of iterating.
Improve concat error message on null Publisher (#1321)
Calling Mono.from(Flux.from(mono)) is now immediately returning the mono instance, as this is conceptually a no-op. (#1329)
- the inverse operation (Flux.from(Mono.from(flux))) is NOT a no-op as it transforms the original Flux into a Mono, so it still returns a different instance.
Use more descriptive parameter names for buffer durations (#1331)

Fix ClassCastException in OneQueue/ZeroQueue + Java9 build (#1326)
When using doOnSuccess and subscribing without an error handler, errors would be swallowed (#1337)
- This now generates a ErrorCallbackNotImplemented exception like in other cases, unless a doOnTerminate is also used
- The best practice is still to always define an error handler when using subscribe(...)

[doc] Point between Flux#create and Flux#push, show multithreading diff (3834537)
[doc] The reference documentation has been extensively reviewed and revised for 3.2 (#1325)
[test] Do not fail HooksTestStaticInit test in IDE (#1322)
[build] Add LGTM.com code quality badges (#1339)