Merge branch '6.4' into 7.1

* 6.4:
  [Serializer] Remove redundant @internal tags from traceable classes
  Fix conversion of partitioned cookies in the PSR-7 bridge
  [Validator] added Polish translation for units 116-119
  Revert stateless check
  [Console] Fix side-effects from running bash completions
  skip transient Redis integration tests on AppVeyor

Resources/completion.bash

@@ -17,7 +17,7 @@ _sf_{{ COMMAND_NAME }}() {
     done
 
     # Use newline as only separator to allow space in completion values
-    IFS=$'\n'
+    local IFS=$'\n'
     local sf_cmd="${COMP_WORDS[0]}"
 
     # for an alias, get the real script behind it