JSONEncoder encodes Dictionary key as JSON value

[20unkown13]

Describe the bug
JSONEncoder encodes Dictionary key as JSON value if Dictionary key is Double, works as intended with String or Int

To Reproduce
Compile this code:

    //Dictionary Key is Type String
    var Key_String : [String:Dictionary<String, Int>] = ["1":["longitude":43,"latitude":53]]
    do {
        let encodedDictionary = try JSONEncoder().encode(Key_String)
        let jsonString = String(data: encodedDictionary, encoding: .utf8)!
        print("Key_String",jsonString) //{"1":{"longitude":43,"latitude":53}}
    } catch {
        print("Error: ", error)
    }
    
    //Dictionary Key is Type Double
    let Key_Double : [Double:Dictionary<String, Int>] = [1.0:["longitude":43,"latitude":53]]
    
    do {
        let encodedDictionary = try JSONEncoder().encode(Key_Double)
        let jsonString = String(data: encodedDictionary, encoding: .utf8)!
        print("Key_Double",jsonString) //[1,{"longitude":43,"latitude":53}]
    } catch {
        print("Error: ", error)
    }
    
    //Dictionary Key is Type Int
    let Key_Int : [Int:Dictionary<String, Int>] = [1:["longitude":43,"latitude":53]]

    do {
        let encodedDictionary = try JSONEncoder().encode(Key_Int)
        let jsonString = String(data: encodedDictionary, encoding: .utf8)!
        print("Key_Int   ",jsonString) //{"1":{"longitude":43,"latitude":53}}
    } catch {
        print("Error: ", error)
    }

Expected behavior
JSONEncoder should encode Dictionary Key as Key

Screenshots

Environment (please complete the following information):

• OS: macOS 12.0.1
• Xcode Version/Tag/Branch: Version 13.4.1 (13F100)