Functions doesn't allow function name or route /api/admin

By default functions has a route prefix of "/api". When I try to create a function with the name "admin", Function gives an error saying

Error:

Function ($admin) Error: The specified route conflicts with one or more built in routes.
Session Id: 19b72d6133b2489987185f757f8c1fe2

Timestamp: 2017-08-11T18:18:36.311Z

Functions built in route uses /admin. Its understandable that this is reserved. However functions with route /api/admin or with any other route prefix should be allowed.

Infact it doesnt even allow function names like administrator or anything that starts with admin.

Reproduce the conflict using a function named "admin", "administrator", or another name beginning with "admin", first with the default /api prefix and then with a different route prefix. Trace the host's built-in /admin route handling and determine whether /api/admin and non-conflicting prefixes can be accepted without weakening the reserved route; done means the affected function routes are accepted while the built-in /admin route remains protected.

Written by the indexing model from the issue text.