Drop(right|left)down split button markup

[pine3ree]

Would it be possible to make the dropdown for dropleft and dropright symmetrical, without further btn-group nesting by using the first|last-of-type selector?

Something like this: https://codepen.io/pine3ree/pen/LYNQYvL

(...in the example I placed the dropdown-menu between the two buttons, but its position should not matter, the important thing would be remove btn-group nesting...and - sorry - used !important just to override the default bootstrap behaviour as I am not considering vertical btn-groups here. Using the first|last-of-type selector make it possible to discard any other non .btn element - such as an absolute positioned initially hidden menu - when deciding which border-radius to drop)

ps
I am not sure why a nested-group was used, but I am sure there is a reason that I was not able to find...that's why I did not open a pr directly.

kind regards