[ruby-core:115764] [Ruby master Feature#20069] Buffer class in stdlib

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

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

* Author: pynix (Pynix wang)
* Status: Open
* Priority: Normal
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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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