commit fe4530531502b99310294de848379d00b0a0ab29
Author: Tom Hughes <tom@compton.nu>
Date:   Thu Nov 12 00:33:56 2015 +0000

    Fix evaluation order

diff --git a/src/back/loader/Base.js b/src/back/loader/Base.js
index 3839111..889e08d 100644
--- a/src/back/loader/Base.js
+++ b/src/back/loader/Base.js
@@ -7,7 +7,7 @@ var BaseLoader = function (project) {
 };
 
 BaseLoader.prototype.postprocess = function () {
-    this.mml.metatile = +(this.mml.metatile || this.mml.source ? 1 : 2);  // Default vectortiles to 1, classic to 2.
+    this.mml.metatile = +(this.mml.metatile || (this.mml.source ? 1 : 2));  // Default vectortiles to 1, classic to 2.
     if (this.mml.Stylesheet) {
         this.mml.Stylesheet = this.mml.Stylesheet.map(this.normalizeStylesheet.bind(this));
     }