Steps to replicate the issue (include links if applicable):
What happens?:
The type for the input argument and the output are not shown.
What should have happened instead?:
The types (in that case, Positive Integer) should be shown.
Software version (skip for WMF-hosted wikis like Wikipedia):
Other information (browser name/version, screenshots, etc.):
Good thing is, it doesn't change the types when saving.
Also, this seems to work with built-in types?
https://wikifunctions.beta.wmflabs.org/w/index.php?title=Z10014&action=edit