Partial provide/inject

[arrudaje]

I have a component that is composed by many children components, all of which use one particular injection key, provided by this parent component. It just so happens that I don't want all children to read from the same provided value, but instead be able to provide a value to be injected in only one child component, for example. I tried to implement a simple Provider component that outputs the default slot and provides whatever is in the prop, but this doesn't work.

Also, I can't use props for the same reason why provide/inject exists: to avoid prop drilling, as those child components have a long chain of children components themselves.