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		043c5ff982
		
	
	
	
	
		
			
			The methods `Take::get_mut` and `Chain::get_mut` include comments warning about modifying the I/O state of the underlying reader. However, many readers (e.g. `File`) allow I/O using a shared reference (e.g. `&File`). So, add the same caveat to the `get_ref` methods.