[ruby-core:108253] [Ruby master Feature#18736] self-p for method chain

Issue #18736 has been reported by aDAVISk (Akito Kawamura).

----------------------------------------
Feature #18736: self-p for method chain
https://bugs.ruby-lang.org/issues/18736

* Author: aDAVISk (Akito Kawamura)
* Status: Open
* Priority: Normal
----------------------------------------
You may want to check object with `p` method at the middle of a method chain.
Here is my recomendation.
 
```ruby
class Object
  def sp(method=nil, *args, &block)
    if method
        Kernel.p self.public_send(method, *args, &block)
    elsif block_given?
        Kernel.p block.call(self)
    else
      Kernel.p self
    end
    return self
  end
end
```

Example of usage:
1) check itself in the middle of a method-call
```ruby
p [1,2,3].map{|x| x**2}.sp.map{|x| x**2}
```
- output
```
[1,4,9]
[1,16,81]
```
2) check its value in some string format
```ruby
[1,2,3].sp{|x| "my List = #{x}"}
```
- output
```
"my List = [1,2,3]"
```
3) check its sum with an initial value
```ruby
[1,2,3].sp(:sum,-10)
```
- output
```
-4
```
4) check its value with a `map` operation
```ruby
[1,2,3].sp(:map){|x| x**2}
```
- output
```
[1,4,9]
```
5) check its value connected in string
```ruby
[1,2,3].sp(:sum,""){|x| x.to_s}
```
- output
```
"123"
```

---
Your brush-up comments are welcomed. thx.



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