Add the numeric type of "percentage" to available options when creating a new attribute. This attribute should be displayed with a "%" sign and stored as the field value / 100. It should allow configuring the precision and upper/lower limit values.
This is very basic and very important. I am creating a field with % symbol in the lable. There is no way for me to isolate the % field type. Important: I need to convert the numeric field type to % field type in future, once the suggestion is implemented?
Ditto to @StackRadius response.