Alias :W to :w in Vim

If you ever type a bit to fast while saving a file, you might find yourself capitalizing that w. It's not trivial to alias a colon command in vim without side effects (like replacing all W's with w's). Fortunately ZyX on Stackoverflow has a solution

cnoreabbrev <expr> W ((getcmdtype() is# ':' && getcmdline() is# 'W')?('w'):('W'))