String changing size on failure?

[Ned Batchelder]

From David Beazley (https://twitter.com/dabeaz/status/925787482515533830):

    >>> a = 'n'
    >>> b = 'ñ'
    >>> sys.getsizeof(a)
   50
    >>> sys.getsizeof(b)
   74
    >>> float(b)
   Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
   ValueError: could not convert string to float: 'ñ'
    >>> sys.getsizeof(b)
   77

Huh?

--Ned.

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