ruby - 方法可变参数（如*options）之后的参数，不可以设置默认值吗？

Question

譬如：

def calculate(*numbers, method = {:add=>true})

就一直报错：

syntax error, unexpected '=', expecting ')' (SyntaxError)

检索The Ruby Programming Wikibook 的相关语法也没有提示，请问这是什么原因呢？

Answer 1

Suppose you are the interpreter, what would you do with calculate({add: true}) 中的参数 {add: true} 分配给 *numbers 呢，还是 method?

You can’t judge at all, right? So it's not allowed.

Answer 2

Can’t this kind of *numbers variable parameters only be at the end?

def calc(method = {add: true}, *numbers); end is allowed, but the reverse is not allowed.

Answer 3

Not allowed, there will be ambiguity