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add OutputReader::fill_uninit() which accepts a `&mut [MaybeInit<u8>]… #154

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add OutputReader::fill_uninit() which accepts a `&mut [MaybeInit<u8>]… #154

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PaulGrandperrin
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to avoid unnecessary memory initialization

@oconnor663
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Is there a safe conversion between something like &mut MaybeUninit<[u8; 64]> and &mut [MaybeUninit<u8>]? It seems like there could be, along the lines of conversions that exist for Cell, but I haven't seen one yet for MaybeUninit. What would a caller look like?

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@PaulGrandperrin @oconnor663