Issue #12381 has been reported by Kazuki Yamaguchi.

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Bug #12381: ext/openssl classes' dup/clone don't work well
https://bugs.ruby-lang.org/issues/12381

* Author: Kazuki Yamaguchi
* Status: Open
* Priority: Normal
* Assignee: openssl
* ruby -v: 
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
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They don't copy the underlying C level structures.

~~~ruby
ssl_ctx = OpenSSL::SSL::SSLContext.new
ssl_ctx.ciphers = "aNULL"
p ssl_ctx.ciphers
# => [["ADH-AES256-GCM-SHA384", "TLSv1.2", 256, 256], .. aNULL cipher suites ..]

new_ctx = ssl_ctx.dup
p new_ctx.ciphers
# => [["ECDHE-ECDSA-AES256-GCM-SHA384", "TLSv1.2", 256, 256], .. the default cipher suites ..]
~~~



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