why a single-object json file appears in an array

[Corgile]

Description

Unexpected '[' and ']', see pic:

Reproduction steps

minimal code to reproduce:

static nlohmann::json parseProfile(std::string profile) {
    std::ifstream file(profile);
    if (not file.is_open()) {
        INFO(RED("无法打开文件: "), profile);
        exit(EXIT_FAILURE);
    }
    return nlohmann::json::parse(file);
}
int main() {
    nlohmann::json profile{parseProfile("/home/brian/Projects/sqlite3-demo/profiles/demo.json")};

    std::cout << profile.dump(2);
}

Expected vs. actual results

expected:

{
  "one": 1,
  "two": "2",
  "tree": [
    1,2,3
  ]
}

actual:

[
  {
    "one": 1,
    "tree": [
      1,
      2,
      3
    ],
    "two": "2"
  }
]

Minimal code example

No response

Error messages

No response

Compiler and operating system

ubuntu 2204

Library version

v3.11.2

Validation

• [ ] The bug also occurs if the latest version from the develop branch is used.
• [x] I can successfully compile and run the unit tests.

[Corgile]

if that's how it actually works, please explain why

[nlohmann]

See https://json.nlohmann.me/home/faq/#brace-initialization-yields-arrays