Signed-off-by: Dariusz Jędrzejczyk <dariusz.jedrzejczyk@broadcom.com>

In a situation where `SwitchOnFirstMain` is subscribed to after the
operator itself has terminated, the expectation is that either an error
is propagated due to cancellation of the source or the first actual
subscription succeeds. Due to a regression introduced in #2794 the
subscription would hang with no termination. This change addresses the
issue and the subscrption properly terminates.

Related to #3936.

Signed-off-by: Dariusz Jędrzejczyk <dariusz.jedrzejczyk@broadcom.com>

Both `KeyValues` and `Tags` unconditionally maintain the invariant that
they wrap distinct key-value pairs so the deduplication logic can be
removed. 
`Scannable#tagsDeduplicated` has been marked as deprecated.

….9.0 (#3946)

Bump org.gradle.toolchains.foojay-resolver-convention

Bumps org.gradle.toolchains.foojay-resolver-convention from 0.8.0 to 0.9.0.

---
updated-dependencies:
- dependency-name: org.gradle.toolchains.foojay-resolver-convention
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

In case of enabled debugging or checkpoints, usage of static exceptions
in user code can cause memory leaks. A warning note has been added to
the debugging section.

Related to #3941

Bumps com.jfrog.artifactory from 4.31.0 to 4.33.1.

---
updated-dependencies:
- dependency-name: com.jfrog.artifactory
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Debug assembly tracebacks and `Scannable#name` should now take much less
time and have a significantly lower allocation rate.

One aspect is used in the debug mode or with the `checkpoint()`
operator. The `Traces#extractOperatorAssemblyInformationParts` is now
greatly optimized.

The other aspect is `Scannable#name` which from now on lazily executes
the current step name. `Scannable#name` logic may be executed many
times, e.g. if a hot code path uses `{Mono,Flux}#log` or Micrometer
instrumentation.

A new benchmark is added to exercise the traceback extraction from a
stacktrace.

As the benchmarks were touched, this change also improves two existing
benchmarks by utilizing the black hole to which benchmark method return
values are implicitly sent.

Follow-up to #3901:
* Renamed `Substring` to `StackLineView`
* Implemented tests for `StackLineView`
* Corrected `contains` and `startsWith` implementations