Fix unused imports
Remove unused variables
Add test case for constructor method
Merge branch 'hotfix/#6096-prevent-php-5.6-arrayobject-infinite-recursion'

Close #6096
Fixed return value for method. #6095
Merge pull request #6097
Merge branch 'hotfix/#6093-dead-code-cleanups'

Close #6093
Merge branch 'hotfix/#6093-dead-code-cleanups' into develop

Close #6093
Forward Port #6093
fixed typos
Merge branch 'hotfix/#6116-typo-fixes'

Close #6116
Merge branch 'hotfix/#6116-typo-fixes' into develop

Close #6116
Forward Port #6116
Zend\Filter\Compress\Tar::setMode() should work with case-insensitive - fix #6102
fix for CS at tests/ZendTest/Filter/Compress/TarTest.php
Merge branch 'hotfix/#6103-#6102-tar-compress-filter-mode-case-insensitive' into develop

Close #6103 #6102