Restored some PHP 7.4 support

src/Dataset.php

@@ -116,11 +116,21 @@ class Dataset
             return $reader;
         }
         $ext = pathinfo($filename, PATHINFO_EXTENSION);
+
+        /*
         return match ($ext) {
             'json' => JsonReader::class,
             'csv' => CsvReader::class,
             default => throw new \RuntimeException("Unable to determine reader for dataset file")
         };
+        */
+
+        // PHP7.4 compat: use switch instead of match
+        switch ($ext) {
+            case 'json': return JsonReader::class;
+            case 'csv': return CsvReader::class;
+            default: throw new \RuntimeException("Unable to determine reader for dataset file");
+        }
     }
     
-}
+}

src/FilteringReaderIterator.php

@@ -10,7 +10,11 @@ class FilteringReaderIterator implements Iterator
 
     private $condition;
 
-    public function __construct(Iterator $reader, array|callable $condition)
+    /**
+     *
+     * @note Removed support for callable in cond (php7.4 compat)
+     */
+    public function __construct(Iterator $reader, array $condition)
     {
         $this->reader = $reader;
         $this->condition = $condition;

src/Readers/JsonReader.php

@@ -38,7 +38,7 @@ class JsonReader implements ReaderInterface
 
         $flags = ($this->options['bigintAsString']??false)?JSON_BIGINT_AS_STRING:0;
         $file = $this->files[$this->currentFile]; 
-        $json = @json_decode(@file_get_contents($file), true, flags:$flags);
+        $json = @json_decode(@file_get_contents($file), true, 512, $flags);
 
         $this->loadData($json);
         $this->loadedFile = $this->currentFile;