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        '4th'
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        >>> intcomma(1_234_567.25)
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        >>> intcomma(1234.5454545, 2)
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        >>> intcomma(14308.40, 1)
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        >>> intword("12400")
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        >>> intword("1000000")
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        >>> intword(1_200_000_000)
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        >>> intword(8100000000000000000000000000000000)
        '8.1 decillion'
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        '1.234 million'

        ```
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        >>> fractional(1.3)
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        >>> fractional(float(1/3))
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        >>> fractional(1)
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        >>> fractional("ten")
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        >>> scientific(-1000)
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        >>> scientific(1000, 1)
        '1.0 x 10³'
        >>> scientific(1000, 3)
        '1.000 x 10³'
        >>> scientific("99")
        '9.90 x 10¹'
        >>> scientific("foo")
        'foo'
        >>> scientific(None) is None
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        >>> clamp(0.99, format="{:.0%}", ceil=0.99)
        '99%'
        >>> clamp(0.999, format="{:.0%}", ceil=0.99)
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        >>> clamp(1, format=intword, floor=1e6, floor_token="under ")
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