"y" in key interpreted as "true"

[strin]

yaml.Unmarshal for the following config will interpret "y" as true.

y: 1

This will lead to a map {true: 1}.

[rogpeppe]

Yes, there are many possible values for boolean, because go-yaml supports YAML 1.1.
See http://yaml.org/type/bool.html for the full list. I agree that this is not ideal - I've been caught by it many times in the past.

I think this is essentially a duplicate of #214, so closing in favour of that.