Proposal: Deprecate decodeUtf8

Andreas Abel andreas.abel at
Thu Aug 18 09:51:39 UTC 2016

+1 LGTM.

On 18.08.2016 11:08, Niklas Hamb├╝chen wrote:
> I propose to add a deprecation pragma to the partial function
> Data.Text.decodeUtf8.
> I see checks or decoding failure accidentally omitted from production
> code every week. I claim decodeUtf8 to be *the* most abused partial
> function in the current Haskell ecosystem (with `head` and `tail` at
> least everybody knows they should feel bad when typing them down).
> decodeUtf8' with custom error message is a better solution in all cases
> I have seen and can come up with.
> I therefore propose:
>   * Add deprecation pragma to decodeUtf8
>   * Do it with Text.Lazy and *16/*32 functions too
>   * But keep them indefinitely (we don't want to break compiles)
> I believe that deprecating decodeUtf8 will result in lots of useful
> warnings across the world every day and less software crashing at runtime.
> Discussion period 2 months.
> Thanks!
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Andreas Abel  <><      Du bist der geliebte Mensch.

Department of Computer Science and Engineering
Chalmers and Gothenburg University, Sweden

andreas.abel at

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