1.42.0 Streaming returning Stream<String> instead of Stream<List<int>> as I'd expect

[JamesFieldist]

Steps to reproduce

1. Use the snippet below.
2. Generate the api.

The endpoint generated will have Stream as the return type instead of Stream<List> as expected.

Also there is no way to turn off streaming in the docs and this is a breaking change to code in a minor version.

Expected results

Stream<List> (and a way to turn off streaming if you want)

Actual results

Stream

Your OpenApi snippet

"/fieldservice/v1/CallLogs/FieldReports/getfieldreportfieldimage/{FieldReportId}/{FieldId}/{ImageId}": {
      "get": {
        "tags": [
          "FieldService"
        ],
        "operationId": "GetFieldReportFieldImage",
        "parameters": [
          {
            "name": "ImageId",
            "in": "path",
            "required": true,
            "schema": {
              "type": "string",
              "format": "uuid"
            },
            "x-position": 1
          },
          {
            "name": "FieldReportId",
            "in": "path",
            "required": true,
            "schema": {
              "type": "string",
              "format": "uuid"
            },
            "x-position": 2
          },
          {
            "name": "FieldId",
            "in": "path",
            "required": true,
            "schema": {
              "type": "string",
              "format": "uuid"
            },
            "x-position": 3
          }
        ],
        "responses": {
          "200": {
            "description": "",
            "content": {
              "application/octet-stream": {
                "schema": {
                  "type": "string",
                  "format": "binary"
                }
              }
            }
          },
          "403": {
            "description": "",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ProblemDetails"
                }
              }
            }
          },
          "404": {
            "description": "",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ProblemDetails"
                }
              }
            }
          },
          "422": {
            "description": "",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/HttpValidationProblemDetails"
                }
              }
            }
          },
          "500": {
            "description": "",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ProblemDetails"
                }
              }
            }
          }
        },
        "security": [
          {
            "bearer": []
          }
        ]
      }
    },

Code sample

N/A

Logs

N/A

Dart version and used packages versions

Dart version

Dart SDK version: 3.10.8 (stable) (Tue Jan 27 00:02:04 2026 -0800) on "macos_arm64"

Packages version

environment:
  sdk: '>=3.10.0 <4.0.0'

dependencies:
  dio: ^5.9.1
  dart_mappable: ^4.6.1
  retrofit: ^4.9.2
  path: ^1.9.1

dev_dependencies:
  analyzer: 
  lints:
  build_runner:
  build: ^4.0.4
  swagger_parser: ^1.42.0
  carapacik_lints:
  dart_mappable_builder: ^4.6.4
  retrofit_generator: 10.2.3
  source_gen: ^4.2.0
  test: