Merge branch 'hotfix/#6184-deprecated-mongodb-flags-replacement'

Close #6184
Merge branch 'doc/#6254-per-component-contributing.md'

Close #6254
Close #6188
Merge branch 'hotfix/#6223-soap-registration-of-complex-type'

Close #6223
Merge branch 'hotfix/#6261-string-trim-allows-0-in-charlist'

Close #6261
Merge branch 'cs/#6038-headlink-docblock-optional-params-hinting'

Type-hints as of phpDocumentor/phpDocumentor2#1194

Close #6038
Digit filter should not touch boolean
Early return for int values which are always just digits
Merge branch 'hotfix/#6277-digit-filter-should-ignore-booleans-backport'

Close #6277
fixes #5144: Cache TTL-Tests: wait for full second before start TTL tests
Merge branch 'master' of https://github.com/zendframework/zf2 into hotfix/5144
Merge branch 'hotfix/#6303-fix-#5144-ttl-tests-stability' into develop

Close #6303
Close #5144
Forward Port #6303
Forward Port #5144