Schroedinger's Ranges

[kdevel]

On Thursday, 3 June 2021 at 01:22:14 UTC, Paul Backus wrote:
>> 		auto tmp = File(filename).byLine();

> `File.byLine` overwrites the previous line's data every time it 
> reads a new line. If you want to store each line's data for 
> later use, you need to use [`byLineCopy`][1] instead.

a) What is the rationale behind not making byLineCopy the default?

b) Does not compile:

csv.d(17): Error: function 
csv.CSVData!true.CSVData.parseCSV(char[] str) is not callable 
using argument types (string)
csv.d(17):        cannot pass argument tmp.front() of type string 
to parameter char[] str
csv.d(21): Error: function 
csv.CSVData!true.CSVData.parseCSV(char[] str) is not callable 
using argument types (string)
csv.d(21):        cannot pass argument e of type string to 
parameter char[] str
[...]/../../src/phobos/std/algorithm/iteration.d(525):        
instantiated from here: MapResult!(__lambda2, 
ByLineCopy!(immutable(char), char))
csv.d(21):        instantiated from here: 
map!(ByLineCopy!(immutable(char), char))
csv.d(40):        instantiated from here: CSVData!true

c) Reminds me of the necessity to add dups here and there. And 
reminds me of "helping the compiler" [1]?

[1] <https://wiki.c2.com/?HelpingTheCompilerIsEvil>