Somewhat interesting, Java has chosen to make substring result in
a copy of the string data rather than returning a window of the
underlying chars.
http://www.reddit.com/r/programming/comments/1qw73v/til_oracle_changed_the_internal_string/
"reduce the size of String instances. [...] This was the trigger."
"avoid memory leakage caused by retained substrings holding the
entire character array."
So apparently substrings were considered a common cause of memory
leaks. I got the impression most of the comments agreed the
result is good, but changing the complexity is bad.
I'm not advocating such a change for D.
