Merge branch '4.4' into 5.1

* 4.4:
  add mising sr (latn & cyrl) translations
  [Cache] fix ProxyAdapter not persisting items with infinite expiration
  [HttpClient] fail properly when the server replies with HTTP/0.9
  Fix CS
  [Cache] Limit cache version character range
  [DI] dump OS-indepent paths in the compiled container
  allow consumers to mock all methods

Author: nicolas-grekas

NumberFormatter/NumberFormatter.php

@@ -691,7 +691,7 @@ private function roundCurrency(float $value, string $currency): float
 
         // Swiss rounding
         if (0 < $roundingIncrement && 0 < $fractionDigits) {
-            $roundingFactor = $roundingIncrement / pow(10, $fractionDigits);
+            $roundingFactor = $roundingIncrement / 10 ** $fractionDigits;
             $value = round($value / $roundingFactor) * $roundingFactor;
         }
 
@@ -713,7 +713,7 @@ private function round($value, int $precision)
         if (isset(self::$phpRoundingMap[$roundingModeAttribute])) {
             $value = round($value, $precision, self::$phpRoundingMap[$roundingModeAttribute]);
         } elseif (isset(self::$customRoundingList[$roundingModeAttribute])) {
-            $roundingCoef = pow(10, $precision);
+            $roundingCoef = 10 ** $precision;
             $value *= $roundingCoef;
             $value = (float) (string) $value;