diff --git a/src/Neon/Node/LiteralNode.php b/src/Neon/Node/LiteralNode.php
index 2dd5990..4029526 100644
--- a/src/Neon/Node/LiteralNode.php
+++ b/src/Neon/Node/LiteralNode.php
@@ -46,16 +46,16 @@ public static function parse(string $value, bool $isKey = false): mixed
 			return self::SimpleTypes[$value];
 
 		} elseif (is_numeric($value)) {
-			return $value * 1;
+			return is_int($num = $value * 1) || preg_match('#[.eE]#', $value) ? $num : $value;
 
 		} elseif (preg_match(self::PatternHex, $value)) {
-			return hexdec($value);
+			return self::baseConvert(substr($value, 2), 16);
 
 		} elseif (preg_match(self::PatternOctal, $value)) {
-			return octdec($value);
+			return self::baseConvert(substr($value, 2), 8);
 
 		} elseif (preg_match(self::PatternBinary, $value)) {
-			return bindec($value);
+			return self::baseConvert(substr($value, 2), 2);
 
 		} elseif (!$isKey && preg_match(self::PatternDatetime, $value)) {
 			return new \DateTimeImmutable($value);
@@ -66,6 +66,32 @@ public static function parse(string $value, bool $isKey = false): mixed
 	}
 
 
+	public static function baseConvert(string $number, int $base): string|int
+	{
+		if (!extension_loaded('bcmath')) {
+			$res = base_convert($number, $base, 10);
+			if (is_float($res)) {
+				throw new Exception("The number '$number' is too large, enable 'bcmath' extension to handle it.");
+			}
+			return $res;
+		}
+
+		$res = '0';
+		for ($i = 0; $i < strlen($number); $i++) {
+			$char = $number[$i];
+			$char = match (true) {
+				$char >= 'a' => ord($char) - 87,
+				$char >= 'A' => ord($char) - 55,
+				default => $char,
+			};
+			$res = bcmul($res, (string) $base, 0);
+			$res = bcadd($res, (string) $char, 0);
+		}
+
+		return is_int($num = $res * 1) ? $num : $res;
+	}
+
+
 	public function toString(): string
 	{
 		if ($this->value instanceof \DateTimeInterface) {
@@ -82,6 +108,7 @@ public function toString(): string
 			return str_contains($res, '.') ? $res : $res . '.0';
 
 		} elseif (is_int($this->value) || is_bool($this->value) || $this->value === null) {
+
 			return json_encode($this->value);
 
 		} else {
diff --git a/tests/Neon/Decoder.phpt b/tests/Neon/Decoder.phpt
index 8646904..c386a6c 100644
--- a/tests/Neon/Decoder.phpt
+++ b/tests/Neon/Decoder.phpt
@@ -35,6 +35,12 @@ $dataSet = [
 		['1.1E1', 11.0],
 		['1.1E+1', 11.0],
 		['1.1E-1', 0.11],
+		['2147483647', 2147483647],
+
+		[(string) PHP_INT_MAX, PHP_INT_MAX],
+		['12341234123412344564654657845465', '12341234123412344564654657845465'],
+		['0x12341234123412344564654657845465', '24196472569643293506997087088694023269'],
+		['12341234123412344564654657845465.0', 12341234123412344564654657845465.0],
 
 		// literals
 		['null', null],