I was going to work on the Space Age exercise on the Go track, and at the bottom of the instructions, under the Planet Type header it says:
“The test cases make use of a custom Planet type that is sent to your function. You will need to implement this custom type yourself. Implementing this new custom type as a string should suffice.”
However, when opening space_age.go, the type is already implemented (line 2). I took the liberty of taking a look and noticed this is added by the instructions.append.md file in the docs folder. I have a change in my local fork ready to delete this file.