Do not encode floats

src/Engine/Encoder.php

@@ -58,9 +58,7 @@ private function encodeValue(mixed $value): void
             $value instanceof \Math_BigInteger,
                 => $this->encodeInteger($value),
             // process strings
-            // floats become strings
             \is_string($value) => $this->encodeString($value),
-            \is_float($value)  => $this->encodeString(\strval($value)),
             // process arrays
             \is_array($value)  => $this->encodeArray($value),
             // process objects

tests/EncodeScalarTest.php

@@ -5,6 +5,7 @@
 namespace Arokettu\Bencode\Tests;
 
 use Arokettu\Bencode\Bencode;
+use Arokettu\Bencode\Exceptions\InvalidArgumentException;
 use PHPUnit\Framework\TestCase;
 
 class EncodeScalarTest extends TestCase
@@ -37,8 +38,13 @@ public function testString(): void
 
         // unicode. prefix number reflects the number if bytes
         self::assertEquals('9:日本語', Bencode::encode('日本語'));
+    }
 
-        // scalars converted to string
-        self::assertEquals('6:3.1416', Bencode::encode(3.1416));
+    public function testFloat(): void
+    {
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage("Bencode doesn't know how to serialize an instance of float");
+        // float cannot be reliably encoded
+        Bencode::encode(3.1416);
     }
 }