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Add extend and read to ringbuffer. #140

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Add extend and read to ringbuffer. #140

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richard-uk1
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I've been using the ringbuffer with its iterators and I can't get the computer to optimize copying, so I made some methods that do it manually. They need examples but I want to check you're interested first.

@mitchmindtree
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Certainly interested, thanks for the PR! Let me know when the examples are in and you'd like me to take a closer look 👍

@richard-uk1
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After experimentation using copy_from_slice doesn't seem slower than ptr::copy_nonoverlapping and doesn't need unsafe, so I'm using that.

@richard-uk1
Implement Bounded::copy.
e18faf6 
Also add examples and remove unsafe.
@richard-uk1
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Ready for review.

@richard-uk1
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friendly bump

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@richard-uk1 @mitchmindtree