Re: [Wget-dev] wget2 | Preallocate file before starting downloading (#450)

[Darshit Shah]

It's not a majority of cases. But such hard failures do happen and we do not 
want to cause breakages at that point. The file not being the right size is an 
important metric to identify that the file wasn't completely downloaded.

`--preallocate` _might_ be an option. But I'm not completely convinced with it. 
It adds extra complexity to the code to handle `-c` and related options when 
`--preallocate` is used.

Also, firefox and others do download to a ".part" file. But none of them 
preallocate the disk space. Moving the ".part" file to its right location des 
not magically defragment the file. The inodes remain as-is on disk, only the 
directory reflects a different filename for it.

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