realized? throws when passed something that's not IPending. Lazy seqs (but not 
all seqs) implement IPending, thus the vast majority of realized? users already 
have an if check prior to making the call. Any code of that form continues to 
work. I think it would be a better idea if realized? did this for you (which is 
the ticket above).

This was discussed at length prior to release and the decision was to leave the 
new range in its current state.

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