[ruby-core:108907] [Ruby master Bug#18826] Symbol#to_proc inconsistent, sometimes calls private methods

Issue #18826 has been updated by Eregon (Benoit Daloze).


Also worth noting that for performance purposes, `Symbol#to_proc` should be able to be cached globally, i.e., cache the Proc in the/per Symbol instance.
So then the `self` inside that Proc should be a sentinel value (`nil` or the Symbol itself).

----------------------------------------
Bug #18826: Symbol#to_proc inconsistent, sometimes calls private methods
https://bugs.ruby-lang.org/issues/18826#change-97991

* Author: bjfish (Brandon Fish)
* Status: Open
* Priority: Normal
* ruby -v: 3.0.3
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
The following usage calls a protected method and prints "hello":

``` ruby
class Test
    protected

    def referenced_columns
        puts "hello"
    end
end      
Test.new.tap(&:referenced_columns)
```
However, the following usage results in a NoMethodError:

``` ruby
class Integer
    private
    def foo
      42
    end
  end

(1..4).collect(&:foo)

```


It seems to be a bug that tap calls a private method. It is also inconsistent with collect not calling private methods.





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