git fails with control characters in trunk directory name

Using the mouse to paste a git url from a website into a terminal session in 
order to clone the repository, I recently managed to include invisible 
control characters into the git trunk directory name. 

Consequently, I faced all sort of strange behaviour like git pull not working 
(error 2), later on a kernel make which supposedly could not finding a rule 
to create the trunk directory and more such inconsistencies. 
I then reinstalled git, rcs and so on and also tried unsuccessfully several  
git versions. The next morning I looked into the .git/config file and 
recognized that the "url" key value within the [remote "origin"] section 
contained some control characters: ^J and \n, as fas as I remember.

While this was almost entirely my fault, git could possibly apply a filter, 
reject such a name or at least issue a warning.