Update NOTES.md

Author: geraldb

bytes/NOTES.md

@@ -20,13 +20,26 @@ or use Bytes for immutable ByteArrays and Buffer for mutable ByteArrays ????
 StringIO is really like a StringBuffer with file-like read/write access
 
 
-### ::Buffer
+### IO::Buffer
+
+see <https://ruby-doc.org/core-3.1.2/IO/Buffer.html>
 
 
 ### More
 
+arraybuffer gem
+- <https://rubygems.org/gems/arraybuffer>
+- <https://github.com/andrepiske/rb-arraybuffer>
+- <https://www.reddit.com/r/ruby/comments/uffg1h/arraybuffer_and_dataview_classes_for_ruby/>
+
+ByteBuffer in nio4r gem
+- <https://rubygems.org/gems/nio4r>
+- <https://github.com/socketry/nio4r>
+- <https://github.com/socketry/nio4r/wiki/Byte-Buffers>
+- <https://www.rubydoc.info/gems/nio4r/2.5.2/NIO/ByteBuffer>
 
 
 ## In other languages
 
+- see python - uses string and bytes (immutable) and bytearray (mutable)
 - see Buffer in node.js