[ruby-core:103834] [Ruby master Feature#17859] Start IRB when running just `ruby`

Issue #17859 has been updated by xtkoba (Tee KOBAYASHI).


user:jaruga For me the slowness of IRB is just annoying for debugging purposes. Putting `-` after the command every time would be distracting. If this proposal is accepted leaving the slowness of IRB as it is, I would write a wrapper script that makes `ruby` command from a terminal without any arguments not invoke IRB.

It is true that gems-enabled ruby is also slow, but not slower than IRB:
```
$ time ruby --enable-gems -e "puts 'hello world'"
hello world

real    0m0.212s
user    0m0.183s
sys     0m0.026s
```

----------------------------------------
Feature #17859: Start IRB when running just `ruby`
https://bugs.ruby-lang.org/issues/17859#change-91952

* 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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