Function getPreparedData

getPreparedData(formMetaData, data): JAttributeValueByName
JMap.Form.getPreparedData

This function prepare the data, it returns a copy object containing the values formatted in a way that fit the server needs.

It's not mandatory to use this function but it's highly recommended to use it before :
- sending them to the server ()
- validating them using JMap.Form.getPreparedData (change values to fit the )
It returns another object without modifing the passed object.

Use to set the correct type (number if a string number is passed), and many other things.
Parameters
- formMetaData: JFormMetaData
  A JMap form's metadata
- data: JAttributeValueByName
  The form data
Returns JAttributeValueByName
the prepared data
Example
```
const data = ...
const form = ...
const preparedData = JMap.Form.getPreparedData(form, data)
const errors = JMap.Form.validateData(form, preparedData)
```