Created attachment 201655 [details]
It shows the cp -R directory bug
The command cp -R has a bug when copying.
cp -R Downloads Downloads
produces a recursive copying, until it reaches some recursion limits.
See the screenshot attached.
It should follow the Linux cp -R behaviour:
Create only one copy of the directory, in itself, and then quit.
POSIX apparently allows the current behaviour but it does not seem sensible.
The proposed alternative seems reasonable.