[ruby-core:103765] [Ruby master Feature#17832] allow IO write to write memoryview object without copying or add IO#write_memoryview

Issue #17832 has been updated by kou (Kouhei Sutou).

Status changed from Open to Third Party's Issue

We can implement this by adding `Fiddle::MemoryView#to_s` with `rb_str_new_static()`.

Could you file this to https://github.com/ruby/fiddle/ ?

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Feature #17832: allow IO write to write memoryview object without copying or add IO#write_memoryview
https://bugs.ruby-lang.org/issues/17832#change-91876

* Author: dsisnero (Dominic Sisneros)
* Status: Third Party's Issue
* Priority: Normal
----------------------------------------
IO#write() - arguments that are not a string will be converted to string using to_s
want IO#write to be able to write memoryview objects without conversion to string 

``` ruby
require 'fiddle'
include Fiddle
ptr = Fiddle::Pointer['this is a string']
mv = MemoryView.new ptr
mv.byte_size  #17802 
mv[0]  # 116
'this is a string'.bytes[0] = 116
File.open('test.txt', 'wb'){ f.write mv}
contents = File.open('test.txt', 'r'){ |f| f.read}  # contents is  "#<Fiddle::MemoryView:0x000001a75ae76258>" not 'this is a string'

buffer = ByteBuffer.new('this is a string')
File.open('test.txt', 'w'){|f| f.write Fiddle::MemoryView.new(buffer)}
```

allow IO#write to write memoryview objects without converting to string or add a new method on IO to write memoryview objects without converting to string

# Related

#17834 
#17833 






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