Fix double encoding of json (#1482)

Author: jmortlock

src/adapter/etl-adapter-json/src/Flow/ETL/Adapter/JSON/RowsNormalizer/EntryNormalizer.php

@@ -26,10 +26,10 @@ public function normalize(Entry $entry) : string|float|int|bool|array|null
             Entry\DateEntry::class => $entry->value()?->format($this->dateFormat),
             Entry\TimeEntry::class => $entry->value() ? date_interval_to_microseconds($entry->value()) : null,
             Entry\EnumEntry::class => $entry->value()?->name,
+            Entry\JsonEntry::class => $entry->value(),
             Entry\ListEntry::class,
             Entry\MapEntry::class,
             Entry\StructureEntry::class,
-            Entry\JsonEntry::class,
             Entry\XMLElementEntry::class => $entry->toString(),
             Entry\XMLEntry::class => $entry->toString(),
             default => $entry->value(),

src/adapter/etl-adapter-json/tests/Flow/ETL/Adapter/JSON/Tests/Integration/JsonTest.php

@@ -6,7 +6,7 @@
 
 use function Flow\ETL\Adapter\JSON\from_json;
 use function Flow\ETL\Adapter\Json\to_json;
-use function Flow\ETL\DSL\{average, df, from_array, overwrite, ref};
+use function Flow\ETL\DSL\{average, df, from_array, from_rows, int_entry, json_entry, overwrite, ref, row};
 use function Flow\ETL\DSL\{config, flow_context, rows};
 use function Flow\Filesystem\DSL\path;
 
@@ -113,6 +113,28 @@ public function test_json_loader_overwrite_mode() : void
         }
     }
 
+    public function test_jsonentry_json_file() : void
+    {
+        $jsonObject = ['short' => 'short_description', 'long' => 'long_description'];
+        df()
+            ->read(from_rows(rows(
+                row(
+                    int_entry('id', 1),
+                    json_entry('nested', $jsonObject),
+                )
+            )))
+            ->saveMode(overwrite())
+            ->write(to_json($path = __DIR__ . '/var/test_jsonentry.json'))
+            ->run();
+
+        self::assertStringContainsString(
+            <<<'JSON'
+[{"id":1,"nested":{"short":"short_description","long":"long_description"}}]
+JSON,
+            \file_get_contents($path)
+        );
+    }
+
     public function test_partitioning_json_file() : void
     {
         df()