Alun Champion added the comment:
Understandable, though it would have also made the first order recurrence
relationships more accurate, e.g. annualized interest on an initial balance:
accumulate(repeat(None), lambda: bal, _: bal*1.05, initializer=1000)
vs. artificially repeating 1000:
accumulate(repeat(1000), lambda: bal, _: bal*1.05)
Or, if the initialiser is expensive:
accumulate(chain([1000], repeat(None)), lambda: bal, _: bal*1.05)
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<http://bugs.python.org/issue25193>
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