Change field type from int to float

I want to change field type from int to float but not allowed in customization any clue why?

Should i add int in tupple of allowed_fieldtype_change? in

Set developer mode 1 and change it from DocType.

But I added some customize field with int type i want to change it to float
I don’t want that change in product so can’t do with edit doctype

you should delete that field and add again that field with change field type.