Add native return types

[kamil-tekiela]

No description provided.

[codecov]

Codecov Report

Patch coverage: 94.11% and no project coverage change.

Comparison is base (9e99de5) 96.64% compared to head (b41c5e5) 96.64%.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #459   +/-   ##
=========================================
  Coverage     96.64%   96.64%           
  Complexity     2216     2216           
=========================================
  Files            67       67           
  Lines          5099     5099           
=========================================
  Hits           4928     4928           
  Misses          171      171           

Impacted Files	Coverage Δ
src/Tools/CustomJsonSerializer.php	0.00% <0.00%> (ø)
src/Tools/TestGenerator.php	0.00% <0.00%> (ø)
src/UtfString.php	100.00% <ø> (ø)
src/Components/AlterOperation.php	98.62% <100.00%> (ø)
src/Components/Array2d.php	95.23% <100.00%> (ø)
src/Components/Condition.php	100.00% <100.00%> (ø)
src/Components/ExpressionArray.php	95.74% <100.00%> (ø)
src/Components/GroupKeyword.php	100.00% <100.00%> (ø)
src/Components/IndexHint.php	100.00% <100.00%> (ø)
src/Components/JoinKeyword.php	96.96% <100.00%> (ø)
... and 18 more

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