Thanks @paddyhoran , and my apologies for being late on ARROW-3089. 

> The general idea here was to implement the Write trait for Buffer this allows 
> Buffer to use the WriteBytesExt extension trait from the byteorder crate 
> which allows Buffer to remain untyped while allowing types that implement 
> ArrowPrimitiveType to be written to a Buffer instance.

I wonder if we can add a `MutableBuffer` struct, alongside the existing 
`Buffer`. The former supports growing as well as modification (perhaps by 
implementing the `Write` trait), and also conversion into a `Buffer`.

[ Full content available at: https://github.com/apache/arrow/pull/2648 ]
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