Swiftyjson: error: cannot assign value of type string to a value of type json

[kyl2007]

var json : JSON = []
var data = [
"name":"asd",
"age":"23"
]
for (key,value) in data {
       json[key] = value
}

error: cannot assign value of type string to a value of type json

[yasuoza]

var json : JSON = [:]  // data is a Dictionary
var data = [
    "name":"asd",
    "age":"23"
]
for (key,value) in data {
    json[key].stringValue = value // or json[key] = JSON(value) 
}

This should work.

[AlexFine]

Out of curiosity why does this error occur? What about wrapping it in a for loop forces us to explicitly type it to a string?