Fix defaults handling

elements/heatmap.js

@@ -6,9 +6,7 @@ const Component = withComponent();
 class Heatmap extends Component {
   static props = {
     timeseries: props.string,
-    days: props.number({
-      default: 7,
-    }),
+    days: props.number,
     interpolate: props.boolean,
     accumulate: props.boolean,
   };
@@ -22,6 +20,10 @@ class Heatmap extends Component {
   }
 
   render({ timeseries, interpolate, accumulate, days }) {
+    let daySlots = days;
+    if (!daySlots) {
+      daySlots = 7;
+    }
     const el = document.createElement('div');
     if (!this.enableFetch) {
       // Not yet connected
@@ -31,7 +33,7 @@ class Heatmap extends Component {
       // We're re-rendering, cancel previous
       this.ts.canceled = true;
     }
-    const ts = new Timeseries(timeseries, new Date(), days);
+    const ts = new Timeseries(timeseries, new Date(), daySlots);
     const data = [{
       x: ts.getSlotLabels(),
       y: ts.getDayLabels(),