Take care with Environment variables

Edit
Created: 2019/10/24
Updated: 2019/10/24

http://www.club.cc.cmu.edu/~cmccabe/blog_the_setenv_fiasco.html

Interestingly, Go takes an interesting approach where they copy the environment into their own map, and then use that for {get,set}env.

I wonder how Erlang, Java and Rust do it?