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Do you guys see any merit in changing the argument order for ifilter so
that the predicate function can just be an optional argument:
 ifilter(data[, pred])
Alex Martelli successfully lobbied for groupby() to have that same
argument order. Originally, the signature was groupby(key, iterable)
but it worked-out much better to have groupby(iterable[, key]).
Also, I like swapped arguments because it more closely parallels the
order used in an equivalent list comprehension:
 [e for e in iterable if pred(e)]