[ruby-core:117478] [Ruby master Bug#20418] `StringIO#read(..., buffer)` doesn't preserve buffer's encoding

Issue #20418 has been reported by andrykonchin (Andrew Konchin).

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Bug #20418: `StringIO#read(..., buffer)` doesn't preserve buffer's encoding
https://bugs.ruby-lang.org/issues/20418

* Author: andrykonchin (Andrew Konchin)
* Status: Open
* ruby -v: 3.2.2
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
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IO#read (and similar methods `#read_nonblock`, `#readpartial`, `#sysread`) when called with a `buffer` argument preserve its encoding. But `StringIO#read` doesn't do so:

```ruby
file = File.open('test.rb')
buffer = "".encode(Encoding::ISO_8859_1)
file.read(10, buffer)
buffer.encoding # => #<Encoding:ISO-8859-1>
```

```ruby
require 'stringio'
io = StringIO.new("# encoding")
buffer = "".encode(Encoding::ISO_8859_1)
io.read(10, buffer)
buffer.encoding # => #<Encoding:ASCII-8BIT>
```

I would expect StringIO's read and similar methods to preserve a buffer's encoding.



-- 
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