Inject from multiple interfaces to singleton

[alebianco]

Considering the class

class A implements IOne implements ITwo {
...
}

With the following mapping:

injector.map(IOne).toSingleton(A);
injector.map(ITwo).toSingleton(A);

I will get two separate instances of class A used for the respective injection points (at least in JS).
I would have expected to have one single instance to be provided whenever one of the interfaces is requested.

I can easily switch to a toValue() type of mapping to solve my case, I was just wondering if this is the expected behaviour and my assumption is totally wrong.