Good name for f.byLine.map!(x => x.idup)?

[HeiHon]

On Sunday, 16 March 2014 at 17:51:31 UTC, Andrei Alexandrescu
wrote:
> On 3/16/14, 10:49 AM, bearophile wrote:
>> "byDupLines"
>
> It introduces the notion of "dup" to newbies. I'd rather go 
> with a natural name.
>

If the newbie already knows that there is a difference between
byLine and byLineWhatever doesn't s/he already know about the
concept of dup?

Anyway
byLineCopy or
byLineCopied
sounds natural for me (native german).