[ruby-core:115767] [Ruby master Feature#20069] Buffer class in stdlib

Issue #20069 has been updated by pynix (Pynix wang).


```
irb(main):048> SecureRandom.bytes(10)
=> "\xB6e\x1C\xF3T\x9C\xA1\xDF\xBD\xEA"
irb(main):049> SecureRandom.bytes(10)
=> "\"\xC4;0\xB3\xA6!\x80jn"
irb(main):050> SecureRandom.bytes(10)
=> "\x9B\x9CP\t~\"\xB9\x8EAn"
irb(main):051> SecureRandom.bytes(10)
=> "\xAA\xDEf\x92\x8E\xEE5]\xD0\xB2"
irb(main):052> SecureRandom.bytes(10)
=> "\xFD\xE9\xF5@n\x1D\x9D\xB4\xB7\x8A"
irb(main):053> SecureRandom.bytes(10)
=> "\xCB\x90\xB0\xCB\xDF\xD2\xED\xAA\a\\"
irb(main):054> SecureRandom.bytes(10)
=> "\x16p\x15\x12\xC0\xD6\x02*D\xDB"
irb(main):055> SecureRandom.bytes(10)
=> "F\x97\xC2d\x84\a\x87\xA3P\b"
irb(main):056> SecureRandom.bytes(10)
=> "\x98\xAB\xA1\x96\x15\x91\x92\xF8e5"
irb(main):057> SecureRandom.bytes(10)
=> "\xE3\xD0\xB5P\x95ys\x0E\xCF'"
irb(main):058> SecureRandom.bytes(10)
=> "\xC5\xFB\x04\x97\xFC\xC0\xF5\xEF{\xA2"


use String as Bytes get a non unified representation, some bytes is translated into string, some not.
```

----------------------------------------
Feature #20069: Buffer class in stdlib
https://bugs.ruby-lang.org/issues/20069#change-105704

* Author: pynix (Pynix wang)
* Status: Open
* Priority: Normal
----------------------------------------
ruby use `String` to deal with bytes, this cause error on irb  "invalid byte sequence in utf-8"

can we get a builtin class like Buffer or Bytes that represent as hex string



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