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>>> only([], default='missing')
'missing'
>>> only([1])
1
>>> only([1, 2])  # doctest: +IGNORE_EXCEPTION_DETAIL
Traceback (most recent call last):
...
ValueError: Expected exactly one item in iterable, but got 1, 2,
 and perhaps more.'
>>> only([1, 2], too_long=TypeError)  # doctest: +IGNORE_EXCEPTION_DETAIL
Traceback (most recent call last):
...
TypeError
Note that :func:`only` attempts to advance *iterable* twice to ensure there
is only one item.  See :func:`spy` or :func:`peekable` to check
iterable contents less destructively.
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