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This should work on stable now.
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The ring buffer will now take and pass ownership as required, so the
`Copy` trait constraint is no longer required.
The one exception is `Writer::unshift_from`, where we're taking data
we don't know how to replace from an arbitrary slice, so that needs to
be `Copy`-able.
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Use mem::MaybeUninit as the backing store so initialization is no
longer required in `new`.
This is safe, because you can't read anything out of the ring buffer
until you store something, which initializes the memory.
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This is just the inverse of Reader::shift and exists for the same
reasons.
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This function can be used if you need to quickly copy a bunch of
things from the buffer, as it only does its safety checks once, rather
than on every item extraction.
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The index is guaranteed to be in bounds because it's always modulo the
array capacity, so use the unchecked variants to get/set values.
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