diff --git a/src/JsonObjectBuilder.php b/src/JsonObjectBuilder.php
index f845b4d..e31bd2d 100644
--- a/src/JsonObjectBuilder.php
+++ b/src/JsonObjectBuilder.php
@@ -15,6 +15,7 @@
 class JsonObjectBuilder extends DataObjectBuilder {
 	public function __construct(
 		private readonly int $depth = 512,
+		private readonly int $flags = 0,
 	) {
 	}
 
@@ -23,7 +24,7 @@ public function fromJsonString(string $jsonString):JsonObject {
 			$json = json_decode(
 				$jsonString,
 				depth: $this->depth,
-				flags: JSON_THROW_ON_ERROR
+				flags: JSON_THROW_ON_ERROR | $this->flags,
 			);
 		}
 		catch(NativeJsonException $exception) {
@@ -39,9 +40,10 @@ public function fromJsonString(string $jsonString):JsonObject {
 	public function fromJsonDecoded(
 		object|array|string|int|float|bool|null $jsonDecoded
 	):JsonObject {
+		/** @noinspection PhpDeprecatedStdLibCallInspection */
 		if(is_array($jsonDecoded)
 		&& !is_int(key($jsonDecoded))) {
-// The JSON could represent an primitive indexed array, but the json could have
+// The JSON could represent a primitive indexed array, but the json could have
 // been decoded as an associative array too. Deal with associative arrays first.
 			$jsonData = $this->fromJsonDecoded(
 				(object)$jsonDecoded
diff --git a/test/phpunit/JsonObjectBuilderTest.php b/test/phpunit/JsonObjectBuilderTest.php
index b323cdb..4e2be09 100644
--- a/test/phpunit/JsonObjectBuilderTest.php
+++ b/test/phpunit/JsonObjectBuilderTest.php
@@ -11,7 +11,6 @@
 use Gt\Json\JsonPrimitive\JsonNullPrimitive;
 use Gt\Json\JsonPrimitive\JsonStringPrimitive;
 use PHPUnit\Framework\TestCase;
-use stdClass;
 
 class JsonObjectBuilderTest extends TestCase {
 	private string $jsonStringSimpleKVP = <<<JSON
@@ -215,4 +214,18 @@ public function testFromJson_depth() {
 		self::expectExceptionMessage("Error decoding JSON: Maximum stack depth exceeded");
 		$sut->fromJsonString($jsonString);
 	}
+
+	public function testFromJson_customFlag_bigInt() {
+		$jsonString = '{"num": 9876543210987654321 }';
+
+		$sut = new JsonObjectBuilder();
+		$json = $sut->fromJsonString($jsonString);
+		$num = $json->getString("num");
+		self::assertStringContainsString("E", $num);
+
+		$sut = new JsonObjectBuilder(flags: JSON_BIGINT_AS_STRING);
+		$json = $sut->fromJsonString($jsonString);
+		$num = $json->getString("num");
+		self::assertSame("9876543210987654321", $num);
+	}
 }