[quote="Zongpei_Jiang, post:6, topic:4607"]
So thats why i want to create a type like `imguint8` that i can also create a `BytesImage.msg` which use the type to deliver image messages like what `Image.msg` does .
[/quote]
The primitive type should not by specific to what "semantic" data you put in. Therefore `img` is in my opinion a no-go. The same type could also store other binary data.
[quote="Zongpei_Jiang, post:6, topic:4607"]
Just map all the `uint8[]` to `bytes[]` instead of `list[]` may cause other problems since some algorithms are designed using the `msg.data` as `list` in python .
[/quote]
That is why I recommended using `byte[]`.
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