[ruby-core:123623] [Ruby Bug#21658] Encoding objects are dumped with an encoding of US-ASCII
From:
"headius (Charles Nutter) via ruby-core" <ruby-core@...>
Date:
2025-10-31 15:59:33 UTC
List:
ruby-core #123623
Issue #21658 has been reported by headius (Charles Nutter).
----------------------------------------
Bug #21658: Encoding objects are dumped with an encoding of US-ASCII
https://bugs.ruby-lang.org/issues/21658
* Author: headius (Charles Nutter)
* Status: Open
* ruby -v: ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [arm64-darwin24]
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
All encodings get Marshal.dump'ed with an encoding instance variable:
```
$ cx ruby-3.4 ruby -e 'Encoding.constants.each { p Marshal.dump(Encoding.const_get(it)) }'
"\x04\bIu:\rEncoding\x10MacJapanese\x06:\x06EF"
"\x04\bIu:\rEncoding\x10MacJapanese\x06:\x06EF"
"\x04\bIu:\rEncoding\rUS-ASCII\x06:\x06EF"
"\x04\bIu:\rEncoding\rUS-ASCII\x06:\x06EF"
"\x04\bIu:\rEncoding\x10MacJapanese\x06:\x06EF"
"\x04\bIu:\rEncoding\nUTF-7\x06:\x06EF"
"\x04\bIu:\rEncoding\nUTF-8\x06:\x06EF"
"\x04\bIu:\rEncoding\nUTF-7\x06:\x06EF"
...
```
This despite the fact that an Encoding does not have an encoding:
```
$ cx ruby-3.4 ruby -e 'Encoding::UTF_8.encoding'
-e:1:in '<main>': undefined method 'encoding' for an instance of Encoding (NoMethodError)
```
Compare with JRuby output:
```
$ cx jruby-10.0.2.0 ruby -e 'p Marshal.dump(Encoding::UTF_8)'
"\x04\bu:\rEncoding\nUTF-8"
```
This extra instance variable data causes the output to be unloadable by JRuby, because an Encoding object cannot itself have an encoding:
```
$ cx jruby-10.0.2.0 ruby -e 'p Marshal.load("\x04\bIu:\rEncoding\nUTF-8\x06:\x06EF")'
ArgumentError: UTF-8is not enc_capable
load at org/jruby/RubyMarshal.java:165
<main> at -e:1
```
This is reported as a JRuby issue here: https://github.com/jruby/jruby/issues/9050
Encoding should not marshal with an encoding it does not actually have.
--
https://bugs.ruby-lang.org/
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