function copy() {
	var keys;
	var env;
	var out;
	var i;

	keys = objectKeys( ENV );
	out = {};
	for ( i = 0; i < keys.length; i++ ) {
		env = keys[ i ];
		out[ env ] = ENV[ env ];
	}
	return out;
}
Copies `process.env`.

## Notes

-   This implementation accommodates `process.env` on older Node.js versions (<=v0.10.x), where `process.env` was object-like, but would show unexpected behavior when attempting to get own property descriptors.

@private
@returns {Object} copy of `process.env`