Map nullable returns types to non-nullable Monos.

[sbuettner]

Map nullable returns types to non-nullable Monos and only allow non-nullable Fluxes. This avoids handling nulls inside Mono operations like map when the Mono was created from a nullable type like String? for example.

[codecov-io]

Codecov Report

Merging #1062 into master will decrease coverage by 0.04%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #1062      +/-   ##
============================================
- Coverage     83.82%   83.77%   -0.05%     
+ Complexity     3464     3463       -1     
============================================
  Files           333      333              
  Lines         27135    27135              
  Branches       5030     5030              
============================================
- Hits          22746    22733      -13     
- Misses         2908     2912       +4     
- Partials       1481     1490       +9

Impacted Files	Coverage Δ	Complexity Δ
...in/kotlin/reactor/core/publisher/MonoExtensions.kt	83.33% <100%> (ø)	0 <0> (ø)	⬇️
...in/kotlin/reactor/core/publisher/FluxExtensions.kt	91.66% <100%> (ø)	0 <0> (ø)	⬇️
...rc/main/java/reactor/core/publisher/MonoDelay.java	73.33% <0%> (-8.89%)	2% <0%> (ø)
.../java/reactor/util/concurrent/MpscLinkedQueue.java	81.57% <0%> (-7.9%)	16% <0%> (-2%)
...c/main/java/reactor/core/scheduler/WorkerTask.java	79.24% <0%> (-3.78%)	19% <0%> (ø)
...ain/java/reactor/util/concurrent/WaitStrategy.java	51.21% <0%> (-1.63%)	11% <0%> (ø)
...in/java/reactor/core/publisher/MonoDelayUntil.java	79.62% <0%> (-0.93%)	4% <0%> (ø)
...java/reactor/core/publisher/FluxBufferTimeout.java	72.85% <0%> (-0.72%)	2% <0%> (ø)
...ain/java/reactor/core/publisher/FluxPublishOn.java	87.21% <0%> (-0.63%)	5% <0%> (ø)
...c/main/java/reactor/core/publisher/FluxExpand.java	92% <0%> (-0.45%)	3% <0%> (ø)
... and 8 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update b4b14b5...10081b0. Read the comment docs.