refactor: cast to number

Author: ghiscoding

src/app/modules/angular-slickgrid/services/__tests__/excelExport.service.spec.ts

@@ -1024,9 +1024,9 @@ describe('ExcelExportService', () => {
             ],
             ['Order: 20 (2 items)'],
             ['Last Name: Z (1 items)'],
-            ['', '1E06', 'John', 'Z', 'Sales Rep.', { metadata: { style: 3 }, value: '10', }],
+            ['', '1E06', 'John', 'Z', 'Sales Rep.', { metadata: { style: 3, type: 'number' }, value: 10, }],
             ['Last Name: Doe (1 items)'],
-            ['', '2B02', 'Jane', 'DOE', 'Finance Manager', { metadata: { style: 3 }, value: '10', }],
+            ['', '2B02', 'Jane', 'DOE', 'Finance Manager', { metadata: { style: 3, type: 'number' }, value: 10, }],
             ['Last Name: null (0 items)'],
             ['', '', '', '', '', '20'],
             ['', '', '', '', '', '10'],

src/app/modules/angular-slickgrid/services/excelExport.service.ts

@@ -252,7 +252,7 @@ export class ExcelExportService {
         }
         break;
       case FieldType.number:
-        const val = isNaN(+data) ? null : data;
+        const val = isNaN(+data) ? null : +data;
         outputData = { value: val, metadata: { style: this._stylesheetFormats.numberFormatter.id } };
         break;
       default: