applyCurrentEnv :: Bool -- ^ require an environment variable to be present?
                -> Value -> IO Value
applyCurrentEnv requireEnv' orig = flip (applyEnvValue requireEnv') orig <$> getCurrentEnv
applyCurrentEnv :: Bool -- ^ require an environment variable to be present?
                -> Value -> IO Value
applyCurrentEnv requireEnv' orig = flip (applyEnvValue requireEnv') orig <$> getCurrentEnv
applyCurrentEnv requireEnv' orig = flip (applyEnvValue requireEnv') orig <$> getCurrentEnv