Rubyの記号プログラミングそのに　使用する記号の種類を減らしてみた

# Rubyの記号プログラミングについて
https://qiita.com/zifre/items/951dc73ae0ee56348538 参照

# 前提
基本方針としては、Symbol#to_procで作成したinstance_eval / send に対象のプログラムを投げ込むことで、任意コード実行を行います

そのため、暗黙のto_procを呼び出すためのprocを作成する ->&\_{\_} 、proc着火のための[]、symbol作成のための :"#{}" で使用される計10種類の記号を減らすことはできません

よって、任意の文字列作成に使用する文字をなるべくこの範囲に収めることを考えます

# 任意の数値作成
前回も述べましたが、数値作成には以下の2通りのパターンがあります

```ruby
""=~/$/ # => 0
""<=>"" # => 0
```

このうち、追加で必要になる文字は、正規表現を利用したものですと =~/$ の4種類。
一方宇宙船演算子を利用したものでは <= の2種類となりますので、宇宙船演算子を採用します

次に任意の数値の作成についてですが、こちらはproc作成の際に-を（加減算で利用）、また宇宙船演算子で<を（ビットシフトで使用）、proc呼び出しで[]を（計算順序変更に使用）それぞれ既に利用しているため、追加で必要となる文字はなく以下のように書けます

```ruby
"[" <=> "" # => 1
[1][0] # => 1
1 -- 1 # => 1 + 1
1 << 1 # => 1 * 2
```

# 任意文字列作成

こちらは前回から特に変更点はなく、下記の通り文字列への数値結合による変換を用います

```ruby
"" << 97 # => "a"
```

# 全体像
文字列については変換前のもので表示していますが、下記のプログラムで任意コードの実行が可能となります

```ruby
->&_{_}[:"#{"instance_eval"}"][[],"instance_evalで実行される文字列"]

#または
->&_{_}[:"#{"instance_eval"}"][*[[]]<<"instance_evalで実行される文字列"]
```

<details><summary>変換用コード</summary><div>
パイプで該当のコードを流し込めば変換後のコードが出力されます

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```
</div></details>

# 最後に
使用した文字種が->&_{}[]"#<=,（または*）の13種類なんですけどどうにか減らす手段ありませんかね …… 最近追加された関数合成(Proc#>>、Proc#<<)がSymbolでも追加されて、to\_proc呼び出してくれれば楽なのですが
\`ruby -e "#{スクリプト}"\`経由のコード実行を行えばもっと減らせますが、それはなんか違う気がするのでそれ以外で