Nested slices are not supported.

[etherealmachine]

Slice of slices are unsupported:

type Request struct {
    Bytes [][]byte
}
func (s *Service) Test(ctx endpoints.Context, req *Request) error {
    return nil
}

Yields this error in the logs: ERROR: Unsupported field: &reflect.StructField{Name:"Bytes", PkgPath:"", Type:(*reflect.rtype)(0x6a90a0), Tag:"", Offset:0x0, Index:[]int{0}, Anonymous:false}