[ed25519FUUU]

I guess beauty is in the eye of the beholder because I look at that syntax and cringe.

[pell]

What about it makes you cringe?

[ed25519FUUU]

This kind of thing

            End
          End
        End
      End
    End

[lgreiv]

While it is not completely impossible to end up (pun intended) with something like this, you usually follow a coding style that avoids it. Kind of like in Ruby.

You have the option to define named methods that yield or to use the short one-parameter syntax where this:

  method do |param|
    param.some_method
  end

becomes

  method &.some_method