Initial blank data for certain field types (number, boolean, etc.) is not being set

Initial blank data is not being set for numbers and boolean (and possibly others). This leads to this error:

```
Warning: A component is changing an uncontrolled input to be controlled.
This is likely caused by the value changing from undefined to a defined value, which should not happen.
Decide between using a controlled or uncontrolled input element for the lifetime of the component.
```