iOS 8 bug reportably could delete iCloud documents

According to the report , the option to "Reset All
Settings," found under Settings — General — Reset in
iOS 8, also deletes documents from the iCloud Drive —
permanently.
The option, which normally resets settings to factory
defaults, clearly states that "no data or media will be
deleted." However, after some users on MacRumors'
forum complained about the bug, MacRumors tested
the option out, and indeed, all the iWork documents
stored in iCloud Drive both on the iPhone and on
iCloud.com were gone.
Even worse, after iCloud synced with a Mac running OS
X Yosemite, the documents were deleted from the Mac
as well. Some of the documents — including Preview
and TextEdit files — were untouched, but all iWork files
seem to be affected.
In some scenarios it's possible to retrieve these files
from a backup folder, or via Time Machine, but nothing
is certain at this point, and Apple still hasn't publicly
acknowledged the bug. For now, iOS 8 users who have
iCloud Drive enabled should probably avoid using the
"Reset All Settings" option.