Strange behaviour when creating array with single element

[misos1]

What is the issue you have?

Seems when calling a function which takes an argument of type json with {j} where j is of type json then is called a copy constructor instead of basic_json(initializer_list_t init....

Please describe the steps to reproduce the issue.

1. See example below

Can you provide a small but working code example?

void func(json j)
{
	printf("%s\n", j.dump().c_str());
}

int main()
{
	json j = 10;
	func({j, j});
	func({10});
	func({j});
}

What is the expected behavior?

func({j}); should print "[10]".

And what is the actual behavior instead?

func({j}); prints "10".

[10,10]
[10]
10

Which compiler and operating system are you using?

• Compiler: Apple clang version 12.0.5 (clang-1205.0.22.9)
• Operating system: Darwin

Which version of the library did you use?

• latest release version 3.10.2
• other release - please state the version: 3.7.0
• the develop branch

If you experience a compilation error: can you compile and run the unit tests?

• yes
• no - please copy/paste the error message below

[nlohmann]

This is a duplicate of #2311. See https://json.nlohmann.me/home/faq/#brace-initialization-yields-arrays.