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Please take a larger view when reviewing the docs. 
The listcomp analogy is very helpful in explaining what 
filter() does and readers would not benefit by its removal.
Throughtout the docs, the phrase "is equivalent to" does 
not mean "is identical to" or "exactly the same as". In 
this case, you have isolated a non-guaranteed 
implementation detail that is almost always irrelevant. 
When an object such as infinite_str lies about its length, 
the consequent behavior is undefined. It is not hard to 
produce weird results when objects violate basic 
invariants such as len(istr)!=len(list(istr)) or the 
expected relation between __eq__ and __hash__.