the any constraint

The `any` type is a predeclared alias for `interface{}` allowing variables to hold values of any type.

The any type is a predeclared alias for interface{} that allows a variable to hold a value of any type. Use it in function signatures or variable declarations to accept or store heterogeneous data without defining a custom interface.

func PrintValue(v any) {
    println(v)
}

var x any = 42
PrintValue(x)