Hi,

I am going through the blog of Stuart Sierra regarding lifecycle 
composition. http://stuartsierra.com/2013/09/15/lifecycle-composition

In the end there is this para - 

"This technique is a form of dependency injection through constructors.
The choice of whether to make the individual components mutable,
stateful objects has an impact on how I can use them later on. In the
original version of this pattern using mutable objects, each component
gets stable references to other components it depends on. In the later
version using immutable data structures, each component gets
references to the *constructed* versions of other components it
depends on, but not the *started* versions of those components,
i.e. the values returned from start."

I am unable to discern the pros and cons of both the versions (approaches). 
Any concrete examples will be appreciated. 

Thanks,
Murtaza

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