[ruby-core:91235] [Ruby trunk Feature#15560] Add support for read/write offsets.

Issue #15560 has been reported by ioquatix (Samuel Williams).

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Feature #15560: Add support for read/write offsets.
https://bugs.ruby-lang.org/issues/15560

* Author: ioquatix (Samuel Williams)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 2.7
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It would be nice if read/write/send/recv/etc methods could accept an offset argument.

e.g.

```
socket = Socket.new(...)
buffer = String.b

socket.read(1024, buffer)
socket.read(1024, buffer, offset: buffer.bytesize)
```

The same for write, e.g.

```
socket = Socket.new(...)
buffer = String.b

amount = socket.write(buffer)
socket.write(buffer, offset: amount)
```

Could also include "size:" so that we can selectively write parts of the buffer.



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