Use coalesce for $avail[$char]

Author: JBlond

.gitignore

@@ -5,6 +5,9 @@
 ### Composer ###
 composer.phar
 /vendor/
+/composer.lock
+/.phpunit.result.cache
+
 
 # Commit your application's lock file https://getcomposer.org/doc/01-basic-usage.md#commit-your-composer-lock-file-to-version-control
 # You may choose to ignore a library lock file http://getcomposer.org/doc/02-libraries.md#lock-file
@@ -72,4 +75,3 @@ local.properties
 
 
 # End of https://www.gitignore.io/api/windows,eclipse,composer
-/composer.lock

lib/jblond/Diff/Similarity.php

@@ -106,7 +106,7 @@ private function getRatioFast(): float
         $aLength = count($this->old);
         for ($iterator = 0; $iterator < $aLength; ++$iterator) {
             $char         = $this->old[$iterator];
-            $numb         = isset($avail[$char]) ? $avail[$char] : $this->uniqueCount2[$char] ?? 0;
+            $numb         = $avail[$char] ?? ($this->uniqueCount2[$char] ?? 0);
             $avail[$char] = $numb - 1;
             if ($numb > 0) {
                 ++$matches;