graphql query format in tutorial is different from the schema, and also another thing

[christopherreay]

This query format documented in:
https://irmin.io/tutorial/graphql/
as compared to the graphiQL web UI
is different

1. everywhere it says "key", is actually "path". Took a minute the graphiQL ui was trying to explain this, but because of 2. I was lost for some time
2. If you happen to use the "history" to enter an old query, two query parameters are added to the URL &variables=null&operationName=undefined, which causes irmin-graphql to return code 500, and also something else impenetrable happens to the url encoded query. These query parameters will remain on the URL, even if some noobwan pastes something that used to work from the tutorial into the box directly without using the history. Until the address bar is manually returned to localhost:8080/graphql, basically nothing anyone tries will work!

Mind was trully boggled for about 3 or 4 hours of having no idea where to look. I looked... in a lot of places, read source code, etc.

big love, amazing project, tytyty

[art-w]

Thanks a lot for discovering and reporting these issues with such details! PRs have been opened to address both points. Do not hesitate if you have seen any other weird behavior that we could address :)