Re: [fetch] Introduce Response.body. (#118) (#128)

>  <dfn title=concept-Body-MIME-type>MIME type</dfn> (initially the empty byte sequence).
>  
> +<p>Objects implementing the <code>Body</code> mixin must define an associated
> +<dfn title=concept-Body-disturbed>disturbed</dfn> predicate and a

A predicate is a function that returns a boolean. It seems like a better model than a flag in this case, since you want it to be re-computed every time it is consulted.

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