Bug: frontend will not adhere to python validation when types are being changed

[phalberg]

Describe the bug
When changing types in the frontend, it does not make an error even though the python code does not allow it.

To Reproduce
Steps to reproduce the behavior:

1. Go to Github pages
2. Fill out the details for a repo (must be public for now)
3. Scroll down and change the type from int to str
4. See no error in js.

Expected behavior
A clear error is supposed to be shown in JS like when changes in the namings of the keys are made.

Desktop (please complete the following information):

• OS: [Windows]
• Browser [Firefox dev. edition]