envy.go
func Map() map[string]string {
	gil.RLock()
	defer gil.RUnlock()
	cp := map[string]string{}
	for k, v := range env {
		cp[k] = v
	}
	return cp
}
func Map() map[string]string {
	gil.RLock()
	defer gil.RUnlock()
	cp := map[string]string{}
	for k, v := range env {
		cp[k] = v
	}
	return cp
}
// Map all of the keys/values set in envy.