[ruby-core:103715] [Ruby master Feature#17848] inline rbs either by rdoc comments or changing syntax

Issue #17848 has been reported by dsisnero (Dominic Sisneros).

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Feature #17848: inline rbs either by rdoc comments or changing syntax
https://bugs.ruby-lang.org/issues/17848

* Author: dsisnero (Dominic Sisneros)
* Status: Open
* Priority: Normal
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I like gradual typing - I like the syntax of rbs files but for coding - convenience it would be nice if we had inline syntax for types. 
I know that steep allows you to define types inline but because it is valid ruby syntax - the code is not as nice as rbs

could we change method arguments syntax to allow rbs type 

def initialize(from: User | Bot = User.new, string: String = "I got your message")  -> void #  I know this has to be fleshed  out to handle all cases (positional , keyword, default but there should be some way we can do it inline)

Either that or bless (recommend) yard style annotations so it is inline and still has easy syntax

 class Message
    attr_reader id: String
    attr_reader string: String
    attr_reader from: User | Bot                     # `|` means union types: `#from` can be `User` or `Bot`
    attr_reader reply_to: Message?                   # `?` means optional type: `#reply_to` can be `nil`

    def initialize: (from: User | Bot, string: String) -> void

    def reply: (from: User | Bot, string: String) -> Message
  end



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