Add fields to the beginning / end of an Edit Form when you cannot predict the field name

When you need to add a field to the start or end of a set of fields on an edit form but you don't know the name of the field to insert it after or before... you can use an empty string...

$fields->insertBefore(TextField::create('MyField', 'MyField'), '');

$fields->insertAfter(TextField::create('MyField', 'MyField'), '');
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