Merge branch '4.4' into 5.2

* 4.4:
  Streamline dataproviders
  fix validator when we have a false current element
  [Mime] Fix case-sensitive handling in Headers::isUniqueHeader()
  [yaml] Delelte unused comparison operation

Dumper.php

@@ -68,7 +68,7 @@ public function dump($input, int $inline = 0, int $indent = 0, int $flags = 0):
                     $output .= "\n";
                 }
 
-                if ($inline >= 1 && Yaml::DUMP_MULTI_LINE_LITERAL_BLOCK & $flags && \is_string($value) && false !== strpos($value, "\n") && false === strpos($value, "\r")) {
+                if (Yaml::DUMP_MULTI_LINE_LITERAL_BLOCK & $flags && \is_string($value) && false !== strpos($value, "\n") && false === strpos($value, "\r")) {
                     // If the first line starts with a space character, the spec requires a blockIndicationIndicator
                     // http://www.yaml.org/spec/1.2/spec.html#id2793979
                     $blockIndentationIndicator = (' ' === substr($value, 0, 1)) ? (string) $this->indentation : '';
@@ -97,7 +97,7 @@ public function dump($input, int $inline = 0, int $indent = 0, int $flags = 0):
                 if ($value instanceof TaggedValue) {
                     $output .= sprintf('%s%s !%s', $prefix, $dumpAsMap ? Inline::dump($key, $flags).':' : '-', $value->getTag());
 
-                    if ($inline >= 1 && Yaml::DUMP_MULTI_LINE_LITERAL_BLOCK & $flags && \is_string($value->getValue()) && false !== strpos($value->getValue(), "\n") && false === strpos($value->getValue(), "\r\n")) {
+                    if (Yaml::DUMP_MULTI_LINE_LITERAL_BLOCK & $flags && \is_string($value->getValue()) && false !== strpos($value->getValue(), "\n") && false === strpos($value->getValue(), "\r\n")) {
                         // If the first line starts with a space character, the spec requires a blockIndicationIndicator
                         // http://www.yaml.org/spec/1.2/spec.html#id2793979
                         $blockIndentationIndicator = (' ' === substr($value->getValue(), 0, 1)) ? (string) $this->indentation : '';