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Add a slightly expanded version of the Decoder type comment to the top
level package doc, which explains that this package is not designed
to be hardened against adversarial inputs.

Change-Id: I8b83433838c8235eb06ded99041fdf726c811ee5
TryBot-Result: Gopher Robot <>
Run-TryBot: Roland Shoemaker <>
Auto-Submit: Roland Shoemaker <>
Reviewed-by: Damien Neil <>


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The Go Programming Language

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