[ruby-core:113057] [Ruby master Feature#19559] Introduce `Symbol#+@` and `Symbol#-@`, and eventually replace boolean arguments with symbols

Issue #19559 has been updated by sawa (Tsuyoshi Sawada).


@austin `-(-:chomp)` would simply be invalid just like when an error is raised when you pass something other than a boolean where a boolean is expected. And in the first place, as I wrote, the implementation is just to illustrate the idea and is not meant to describe the details.

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Feature #19559: Introduce `Symbol#+@` and `Symbol#-@`, and eventually replace boolean arguments with symbols
https://bugs.ruby-lang.org/issues/19559#change-102595

* Author: sawa (Tsuyoshi Sawada)
* Status: Open
* Priority: Normal
----------------------------------------
I propose to define `Symbol#+@` and `Symbol#-@`, so that we can add positive or negative polarity to symbols. A possible implementation can be equivalent to what can be achieved by this:

```ruby
class Symbol
  def -@; "-#{self}".to_sym end
  def +@; self end
end
```

The intention behind this is to, eventually, replace boolean positional or keyword arguments with symbols so that, instead of this:

```ruby
"foo".methods(false)

gets(chomp: true)

Integer("2.3", exception: false)
```

we can write like this:

```ruby
"foo".methods(-:inherit)

gets(+:chomp)

Integer("2.3", -:exception)
```



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