Return :error as first element of tuple instead of :fail #4
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This updates
ExRated.check_rate/3
to return{:error, limit}
when the rate limit is exceeded, rather than{:fail, limit}
. Using:error
as the first key of a returned tuple seems to be a pretty standard Elixir pattern, and it will make it easier to integrate ex_rated with other libraries, like MonadEx.If you're using SemVer, this might require a major version bump (i.e. 1.0.0) since this change is not backwards compatible.