How to use bufio.reader_init_with_buf to stream file contents to a buffer

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Hi. I’m using this to read a certain number of bytes at a time from a file.examples I’ve seen so far use this os.stream_from_handle proc, but I see in the latest it is in the core/old folder and my compiler says that it’s not declared by os.

Edit: Just saw this Moving Towards a New "core:os" | Odin Programming Language. I guess I’m testing the bleeding edge. I found it was

	reader: bufio.Reader
	buffer: []byte
	bufio.reader_init(&reader, os.to_stream(file))