Whenever I `elm-make`, I give it the `--warn` option, however, this often 
makes the compiler generate warnings like "Top-level value `foo` does not 
have a type annotation.", if there are a lot of these, it would make the 
real warnings hard to notice.

Sometimes I deliberately omit type annotations for top level values, the 
reason is that these values are just some strings and numbers, (like CSS 
colors, some constants, etc.), or even initial model of type Model, there 
is really no need to annotate them, and annotating them would make the code 
looks uglier (because in the case of CSS colors, you often have several 
colors in succession, like `white=Css.hex "aabbcc" \n black=Css.hex 
"bbccdd" \n green=Css.hex "ccddee", if you annotate them, it becomes 

As someone pointed out, a good consequence of type inference is that you 
don't have to write type declarations if you don't want to, however, I 
think Elm may have a different opinion on this.

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