Merge pull request #3113 from davidbrochart/fix_slider

Fix slider format

Author: SylvainCorlay

packages/controls/src/widget_int.ts

@@ -215,7 +215,7 @@ export abstract class BaseIntSliderView extends DescriptionView {
       orientation: orientation,
       direction: orientation === 'horizontal' ? 'ltr' : 'rtl',
       format: {
-        from: (value: number): number => value,
+        from: (value: string): number => Number(value),
         to: (value: number): number => value
       }
     });