Improve RFC conformance of the "include" mechanism

[mlocati]

No description provided.

[codecov-commenter]

Codecov Report

Merging #10 into master will decrease coverage by 2.44%.
The diff coverage is 37.20%.

@@             Coverage Diff              @@
##             master      #10      +/-   ##
============================================
- Coverage     90.20%   87.75%   -2.45%     
- Complexity      526      550      +24     
============================================
  Files            35       36       +1     
  Lines          1133     1176      +43     
============================================
+ Hits           1022     1032      +10     
- Misses          111      144      +33     

Flag	Coverage Δ	Complexity Δ
#unittests	87.75% <37.20%> (-2.45%)	550.00 <39.00> (+24.00)	⬇️

Impacted Files	Coverage Δ	Complexity Δ
src/Check/Result.php	82.60% <0.00%> (-17.40%)	13.00 <2.00> (+2.00)	⬇️
src/Check/State.php	100.00% <ø> (ø)	13.00 <0.00> (ø)
src/Exception/IncludeMechanismException.php	0.00% <0.00%> (ø)	5.00 <5.00> (?)
src/Checker.php	74.25% <47.05%> (-4.84%)	117.00 <32.00> (+17.00)	⬇️

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