clientv3/concurrency/stm.go
func NewSTMRepeatable(ctx context.Context, c *v3.Client, apply func(STM) error) (*v3.TxnResponse, error) {
	return NewSTM(c, apply, WithAbortContext(ctx), WithIsolation(RepeatableReads))
}
func NewSTMRepeatable(ctx context.Context, c *v3.Client, apply func(STM) error) (*v3.TxnResponse, error) {
	return NewSTM(c, apply, WithAbortContext(ctx), WithIsolation(RepeatableReads))
}
// NewSTMRepeatable is deprecated.