All numbers get converted to float when sending JSON resulting in unexpected behaviour in Proxies

[axsaucedo]

When sending a JSON request such as { "jsonData": { "instances": [{ "length": 9 }] } }, the number 9 would get converted into 9.0. This becomes an issue in the TFProxy as the number datatypes would be changed, resulting in unexpected behaviour that differs from sending the request directly to the TFX server.

This can be reproduced by running the following code:

from seldon_core.utils import seldon_message_to_json, json_to_seldon_message
seldon_message_to_json(
    json_to_seldon_message(
         { "jsonData": [ { "length": 9 } ] }
    )
)

Which outputs:

{'jsonData': [{'length': 9.0}]}

If you just run:

 json_to_seldon_message(
         { "jsonData": [ { "length": 9 } ] }
    )

You are able to see that the GRPC proto message converted is already changed to float:

list_value {
  values {
    struct_value {
      fields {
        key: "length"
        value {
          number_value: 9.0
        }
      }
    }
  }
}