Issue #13874 has been reported by ojundt (Oliver Jundt).

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Bug #13874: String#valid_encoding? has side effects
https://bugs.ruby-lang.org/issues/13874

* Author: ojundt (Oliver Jundt)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-darwin16]
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
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I noticed the result of `String#encode` changes after a call to `String#valid_encoding?`. Other side effects were not visible so far.

Based on the documentation and intuition I would expect `#valid_encoding?` to be an operation without side effects.

~~~ ruby
content = "\xE5".dup.force_encoding(Encoding::ASCII_8BIT)

p content.encode(Encoding::UTF_8, Encoding::UTF_8, invalid: :replace, undef: :replace, replace: '?')
=> "?"

content.valid_encoding?

p content.encode(Encoding::UTF_8, Encoding::UTF_8, invalid: :replace, undef: :replace, replace: '?')
=> "\xE5"
~~~



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