func NewExpressionsEnvLoader() EnvLoader {
	return alwaysNewEnvLoader{loadFn: func(envSet *environment.EnvSet) *cel.Env {
		return envSet.NewExpressionsEnv()
	}}
}

// StoredExpressionsEnvLoader creates an EnvLoader that always uses the StoredExpressions environment type.
func StoredExpressionsEnvLoader() EnvLoader {

	if pe.rules.Has(expression) {
		return envSet.StoredExpressionsEnv()
	}
	return envSet.NewExpressionsEnv()
}

func (pe preexistingExpressions) MessageExpressionEnv(envSet *environment.EnvSet, expression string) *celgo.Env {
	if pe.messageExpressions.Has(expression) {
		return envSet.StoredExpressionsEnv()
	}
	return envSet.NewExpressionsEnv()
}