Composition and inheritance: the Julian way

General Usage
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In terms of macros to avoid boilerplate code using type composition, I wrote this recently:

It takes care of boilerplate fields, parametric types and macros in a fully automated way, you just write a struct with the @mix macro in front of it:

@mix @with_kw struct Foo{T} 
    bar:T = 100
end

Then use @Foo as a macro in front of other structs and voila. Fields, types, macros, default params, whatever. You can even chain them, and apply the @Foo macro to another @mix macro to merge them.