Adding a read primitive to ranges

[Freddy via Digitalmars-d]

> How would it be more optimal? As I said, if you pass in 
> `file.byChunks(some_amount).joiner`, this will still read the 
> file in large chunks. It's less optimal now because `read` has 
> to allocate an array on every call (easily avoidable by passing 
> in a reusable buffer, but still).
>
> Equivalent code with ranges:
>
>     auto range = file.byChunks(4096).joiner;
>     ubyte[] data = range.take(VERY_BIG_NUMBER).array;
>     ubyte[] other_data = 
> range.take(OTHER_VERY_BIG_NUMBER).array;

The range solution copies from a buffer to a newly allocated 
array many times, doing many system calls.
The read(stream) solution allocates a new array and does one 
system call.

Sorry for the miscommunication.