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

[HeiHon]

Depends on the situation. Consider a D tutorial. It would 
feature little programs like "copy a file" or "put each line in 
a hashtable" etc.

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

Another idea:
byLineDuplicate

Might be a bit (too) long, but probably could help leading to the 
topic of dup/idup and the like.