py3: make osenvironb a proxy for, instead of a copy of os.environ where needed
Without this, TESTDIR and a few other variables weren't defined in the *.t test.
I didn't bother implementing all of the view functions for simplicity. All that
is actually used is __{get,set}item__(), get() and pop(), but the rest seems
easy enough to add for futureproofing.
{
// Enforcing
"eqeqeq" : true, // true: Require triple equals (===) for comparison
"forin" : true, // true: Require filtering for..in loops with obj.hasOwnProperty()
"freeze" : true, // true: prohibits overwriting prototypes of native objects such as Array, Date etc.
"nonbsp" : true, // true: Prohibit "non-breaking whitespace" characters.
"undef" : true, // true: Require all non-global variables to be declared (prevents global leaks)
// Environments
"browser" : true // Web Browser (window, document, etc)
}