[ruby-core:93708] [Ruby master Feature#15973] Make it so Kernel#lambda always return a lambda

Issue #15973 has been updated by alanwu (Alan Wu).


The idea to generate a delegating lambda seems to side-step a lot of the issues posted here.
For reference here are some quotes from the log in #15930:

```ruby
b = proc {|x| x }
lambda(&b) #=> lambda {|x| b[x] }
 
b = proc {|x, y, k:1| x }
lambda(&b) #=> lambda {|x, y, k:1| b[x, y, k:k] }
```
This preserves the `return` semantics in the original proc. I would imagine it would also add an entry to the call stack.
(side note, I think the default parameter evaluation has to be left to the original proc too since a `return` could be in there)

What do you folks think about this?

----------------------------------------
Feature #15973: Make it so Kernel#lambda always return a lambda
https://bugs.ruby-lang.org/issues/15973#change-79336

* Author: alanwu (Alan Wu)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
----------------------------------------
When Kernel#lambda receives a Proc that is not a lambda,
it returns it without modification. l propose changing `Kernel#lambda`
so it always returns a lambda.

Calling a method called lambda and having it effective do nothing was
not very intuitive.

https://github.com/ruby/ruby/pull/2262

Judging from marcandre's investigation here: https://bugs.ruby-lang.org/issues/15620#note-1
changing the behavior should not cause much breakage, if any. 


This also happens to fix [Bug #15620]



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