[ruby-core:103825] [Ruby master Feature#17859] Start IRB when running just `ruby`

Issue #17859 has been updated by zverok (Victor Shepelev).


Two observations from my experience with Python:

1. Python (in the modern default installation, I believe) has _two_ consoles: `python` which loads instantaneously, has no syntax highlight, and very simplistic autocomplete; and `ipython` with rich autocomplete, cool syntax highlighting and whatnot, but takes some time to load. (See also @xtkoba's comment above about loading time)
2. When starting to work with Python after Ruby, I was constantly bugged with _undesired_ interpreter start, most notably when running `python -v` (trying to ask "what version of Python do I have?", with `-v` being almost universal shortcut for it, but instead having a full screen of gibberish, because it runs interpreter in verbose mode). It should be avoided.

----------------------------------------
Feature #17859: Start IRB when running just `ruby`
https://bugs.ruby-lang.org/issues/17859#change-91943

* Author: deivid (David Rodr刕uez)
* Status: Open
* Priority: Normal
----------------------------------------
Compare python:

```
$ python
Python 3.8.3 (default, Jul  8 2020, 16:49:12) 
[GCC 7.5.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> 
```

To ruby:

```
$ ruby
# just hangs
```

I think firing up a console it's a good default behaviour for beginners.



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