A modern programming language that makes developers happier.

kotlinlang

Hi, can someone help me to understand a behavior with MessageSource and Kotlin?
I have the following code that i use in my project:
```@Component
class MessageService(private val messageSource : MessageSource) {
    fun getMessage(id: String, vararg params: String) : String {
        val locale = LocaleContextHolder.getLocale()
        return messageSource.getMessage(id, arrayOf(params), id, locale)
    }
}```
When called like this, where cardNumber is String: 
`val message = messageService.getMessage(messageKey, cardNumber)`
the result message: `your card number: [Ljava.lang.String;@6b25306c`

But if I change to use the spread operator,
`return messageSource.getMessage(id, arrayOf(*params), id, locale)`
 it outputs the actual value of cardNumber. Why?