Why does len() on a filter object in py3 not just materialize the result instead of raising an error that's mostly unhelpful?
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so really it's an unhelpful "precaution"
I'd look at it this way: If it did what you want, then ppl reading code have to lookout for calls to len() as possibly allocating
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As it is, they only have to look at list()/tuple(), etc., object constructors, as possbly allocating. easier to reason about
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I see your point but it should be obvious that len just has to traverse the entirety of your data (absent storing the length)
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