Issue #11760 has been reported by Nobuyoshi Nakada.

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Bug #11760: Encoding is tainted unexpectedly by Marshal.load
https://bugs.ruby-lang.org/issues/11760

* Author: Nobuyoshi Nakada
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: r52850
* Backport: 2.0.0: REQUIRED, 2.1: REQUIRED, 2.2: REQUIRED
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By `Marshal.load`ing tainted source, `Encoding` object will be tainted.

## code to reproduce
~~~ruby
e = Encoding::UTF_8
p e.tainted?
p e == Marshal.load(Marshal.dump(e).taint)
p e.tainted?
~~~

## expected results
`false`, `true`, and `false`

## actual results
`false`, `true`, and `true`




-- 
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