added zendframework/zendxml into require at Zend\Json's composer.json
move zendxml to suggest and mark to Json::fromXml() as @deprecated
update comment on suggest
Memcached returns FALSE on failure
... so it's not required to check for NULL, too.
The note Memcached returns NULL was a miss information in changelog of memcached-2.0
String access via brackets instead of braces
Replace Nested Conditional with Guard Clauses
Merge branch 'cs/#6873-cs-braces-string-access-and-class-declaration-psr2-compliance'

Close #6873
Fixed #6818
added PR id to @deprecated
/see/by
Merge branch 'hotfix/#6877-zend-session-event-manager-dependency'

Close #6877
Close #6818
Merge branch 'hotfix/#6871-memcache-return-false-on-failure-perf-improvement'

Close #6871
Merge branch 'hotfix/#6778-zendxml-suggestion-in-zend-json'

Close #6778
Return the text value in _ array key

If element has attributes & string value until now the string value was ignored & lost, I added the _ index so that it also returns the string value along with the attribute names
Fix CS + reduce branch depth
Reproducing test case for #6279
#6279 - #6879 - minor CS fixes
Merge branch 'hotfix/#6279-#6879-zend-config-reader-xml-node-value-conflict'

Close #6279
Close #6879
Preserve the fluent interface
#6398 - minor CS fixes (spacing, return type)