Version: 3.1.0

It looks like {:error, :invalid, integer} is a valid return type for both Poison.decode/2 and Parser.parser/2, but neither type spec reflects this.

Here is where a tuple of that type is possibly returned:

• https://github.com/devinus/poison/blob/3.1.0/lib/poison/parser.ex#L44

Notice the typespecs of Poison.decode/2 and Parser.parser/2 do not include this type:

• https://github.com/devinus/poison/blob/3.1.0/lib/poison/parser.ex#L32-L33
• https://github.com/devinus/poison/blob/3.1.0/lib/poison.ex#L66-L67

I noticed this when {:error, :invalid, 0} was returned by Poison.decode/2 in our production app.