INF & NAN encoding throws an exception [Closes #69]

Author: dg

src/Neon/Node/LiteralNode.php

@@ -9,6 +9,7 @@
 
 namespace Nette\Neon\Node;
 
+use Nette\Neon\Exception;
 use Nette\Neon\Node;
 
 
@@ -74,6 +75,9 @@ public function toString(): string
 			return $this->value;
 
 		} elseif (is_float($this->value)) {
+			if (!is_finite($this->value)) {
+				throw new Exception('INF and NAN cannot be encoded to NEON');
+			}
 			$res = json_encode($this->value);
 			return str_contains($res, '.') ? $res : $res . '.0';
 

tests/Neon/Encoder.phpt

@@ -164,3 +164,9 @@ Assert::same(
 	'[]',
 	Neon::encode([], Neon::BLOCK),
 );
+
+Assert::exception(
+	fn() => Neon::encode(INF),
+	Nette\Neon\Exception::class,
+	'INF and NAN cannot be encoded to NEON',
+);