Serializable Isolation and read/write conflict with index and different keys

[Luca Looz <luca.looz92@xxxxxxxxx>]

I'm trying to use the serializable isolation but i'm getting read/write dependencies error even if i have an unique index on the column used and the transactions are using different keys.

For an example see this gist:

https://gist.github.com/nathanl/f98450014f62dcaf0405394a0955e18e

Is this an expected behavior?