dupe and comment: format and comment new "do" implementation

i find it easier to read when the different parts are separated,
and while i have done one-line `if this then do that end`s before,
i've only ever done it for short operations where it's immediately
obvious what's going on and you don't need to do any thinking whatsoever.

e.g. this function from depctrl config:
        local function get_log_level(num)
                if num == 0 then return "0: Fatal"
                elseif num == 1 then return "1: Error"
                elseif num == 2 then return "2: Warning"
                elseif num == 3 then return "3: Hint"
                elseif num == 4 then return "4: Debug"
                elseif num == 5 then return "5: Trace" end
                return nil
        end
I don't think the bits that fix sel and act count, at least not without comments.

speaking of comments, i've added some.
i hope i've understood what's going on correctly, please feel free to correct me if not.

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