Modify njk.

Runtime/rendering/box.mixin.njk

         where ChildType : RenderBox
         where ParentDataType : ContainerParentDataMixinBoxParentData<ChildType> {
         
-        public double? defaultComputeDistanceToFirstActualBaseline(TextBaseline baseline) {
+        public float? defaultComputeDistanceToFirstActualBaseline(TextBaseline baseline) {
-                double? result = child.getDistanceToActualBaseline(baseline);
+                float? result = child.getDistanceToActualBaseline(baseline);
                 if (result != null) {
                     return result.Value + childParentData.offset.dy;
                 }
             return null;
         }
 
-        public double? defaultComputeDistanceToHighestActualBaseline(TextBaseline baseline) {
-            double? result = null;
+        public float? defaultComputeDistanceToHighestActualBaseline(TextBaseline baseline) {
+            float? result = null;
-                double? candidate = child.getDistanceToActualBaseline(baseline);
+                float? candidate = child.getDistanceToActualBaseline(baseline);
                 if (candidate != null) {
                     candidate += childParentData.offset.dy;
                     if (result != null) {

Runtime/rendering/proxy_box.mixin.njk

             }
         }
 
-        protected override double computeMinIntrinsicWidth(double height) {
+        protected override float computeMinIntrinsicWidth(float height) {
             if (this.child != null) {
                 return this.child.getMinIntrinsicWidth(height);
             }
 
-        protected override double computeMaxIntrinsicWidth(double height) {
+        protected override float computeMaxIntrinsicWidth(float height) {
             if (this.child != null) {
                 return this.child.getMaxIntrinsicWidth(height);
             }
 
-        protected override double computeMinIntrinsicHeight(double width) {
+        protected override float computeMinIntrinsicHeight(float width) {
             if (this.child != null) {
                 return this.child.getMinIntrinsicHeight(width);
             }
 
-        protected override double computeMaxIntrinsicHeight(double width) {
+        protected override float computeMaxIntrinsicHeight(float width) {
             if (this.child != null) {
                 return this.child.getMaxIntrinsicHeight(width);
             }
 
-        protected override double? computeDistanceToActualBaseline(TextBaseline baseline) {
+        protected override float? computeDistanceToActualBaseline(TextBaseline baseline) {
             if (this.child != null) {
                 return this.child.getDistanceToActualBaseline(baseline);
             }