Merge pull request #174 from agoat/master

Fix false number recomposing and NaN number problem

anime.js

@@ -453,7 +453,7 @@
   }
 
   function recomposeValue(numbers, strings) {
-    return (strings.length === 0) ?  numbers[0] : strings.reduce((a, b, i) => a + numbers[i - 1] + b);
+    return (strings.length === 0) ?  numbers[0] : strings.reduce((a, b, i) => a + numbers[i - 1] + (b ? b : ' '));
   }
 
   // Animatables
@@ -703,7 +703,7 @@
         const elapsed = minMaxValue(insTime - tween.start - tween.delay, 0, tween.duration) / tween.duration;
         const eased = tween.easing(elapsed, tween.elasticity);
         const progress = recomposeValue(tween.to.numbers.map((number, p) => {
-          const start = isPath ? 0 : tween.from.numbers[p];
+          const start = isPath || !tween.from.numbers[p] ? 0 : tween.from.numbers[p];
           let value = start + eased * (number - start);
           if (isPath) value = getPathProgress(tween.value, value);
           if (round) value = Math.round(value * round) / round;