Do Not Iterate IEnumerable Multiple Times!
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When writing a function that receives a sequence of objects you might need to walk the sequence more than once.
Don't do that!
You never know who is calling.
If they had a collection, the wouldn't care.
But the caller might have a dynamic sequence.
Iterating it twice would double the resources required to construct it.
You don't know how much that is and hence your function's performance would be unpredictable.
And worse.
The caller might send you the result of a database query or a similar data source.
You don't want your function to trigger every database query two times!
And worse!
The data source could be a one-shot such as the incoming stream, a socket stream throwing an exception if you try to read it again.
A better design is to request a materialized collection which is safe to iterate multiple times.
For convenience, you can retain that method with IEnumerable but materialize the data yourself if the caller could not.
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