`exportFormat` not working with `callable`

[Seb33300]

The exportFormat method is supposed to accept callable argument:

->exportFormat(fn ($a) => 'test')

But when I try to do this, I am getting the following exception:

str_contains(): Argument #1 ($haystack) must be of type string, Closure given

laravel-datatables-export/src/Jobs/DataTableExportJob.php

Lines 255 to 258 in 399bff1

	protected function wantsNumeric(Column $column): bool
	{
	return Str::contains($column->exportFormat, ['0', '#']);
	}

[Seb33300]

After more investigation on this, I just discovered the exportRender that support callable.
I think this option should be used, but it looks like not used in that repo.

I will try to create a PR for this.