meteficha/aws — comment on commit 344928c97a403006bcb2b5d3e80f33339e862f6a
File: Aws/Ses/Error.hs line 17
By aristidb:

Uh, Amazon's error code descriptions are not particularly reliable. Particularly, they may randomly upcase/downcase things. Be aware of this. In the other libraries I just gave up and used Text instead as the error code type.

(I even had Template Haskell magic to write code for converting between codes and data values and vice versa, but then I saw that maintaining these lists would be quite some effort.)