Number fields from ScriptField(ScriptRunner) are not being exported as a number to Excel format

Steps to reproduce:

1. Install ScriptRunner(It can be the latest version)
2. Create a ScriptField with name NumberField
3. Go to Manage Apps -> ScriptRunner -> Script Fields and edit the field you have created.
4. add

   return new Integer(100);
   

   and save it

5. Create an Excel Template with ${NumberField}
6. Go to an issue and export the issue using the template created.
7. As you can see, the value exporter is not a number.