Treat a lazy limit of zero as parsing everything up front

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## Unreleased
+
+### Fixed
+
+- **`FLATPACK_LAZY_LIMIT=0` no longer stops the build.** The setting is documented as "parse everything up front", but a limit of zero was read as "every field is over the limit", so every field (the id and title included) was set aside to be parsed later and `flatpack:build` failed with `Unsupported operand types: array + null`. Zero now means what the config file says.
+
 ## 1.2.1 (2026-11-11)
 
 ### Changed

src/Flatpack.php

@@ -17,7 +17,8 @@ final class Flatpack
     public static function configure(string $path, int $lazyLimit = 2048): void
     {
         self::$path = rtrim($path, '/');
-        self::$lazyLimit = $lazyLimit;
+        // Nothing is over a limit of zero or less, so it means "never": everything is parsed up front.
+        self::$lazyLimit = $lazyLimit > 0 ? $lazyLimit : PHP_INT_MAX;
         self::$bodies = null;
     }