[ruby-core:91556] [Ruby trunk Feature#15606] Precendence of -@ and +@

Issue #15606 has been reported by sos4nt (Stefan Schテシテ殕er).

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Feature #15606: Precendence of -@ and +@
https://bugs.ruby-lang.org/issues/15606

* Author: sos4nt (Stefan Schテシテ殕er)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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`-@` and `+@` seem to have issues with method chaining:

```ruby
i = 5

-i.negative?
# NoMethodError (undefined method `-@' for false:FalseClass)
```

here's another example:

```ruby
# frozen_string_literal: true

+'foo'.upcase!
# FrozenError (can't modify frozen String)
```

I know that I can fix this by adding parentheses, i.e. `(-i).negative?` and `(+'foo').upcase!` but it feels cumbersome.

Shouldn't the above work out of the box?

Unless I'm missing a crucial use case, the precedence for `-@` and `+@` should be changed.



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