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fix(currency): Handle not-quite-zero values #1477

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Commits on Oct 19, 2012

  1. fix(currency): Handle not-quite-zero values

    IEEE 754 floating point sometimes results in values that are very small,
    rather than zero. One example is 1.0 + 1.07 - 2.07, which returns
    4.440892098500626e-16 instead of 0.
    
    This change tweaks the number formatting logic so that an exponential
    value with a negative exponent that is larger than the precision+1
    returns 0 instead. For example: with precision 2, anything with an
    exponent of -4, -5 or more would become 0. 9e-3 = 0.009 = 0.01, but 9e-4
    = 0.0009 = 0.001 = 0.00. This detail is unlikely to matter since this
    quirk is usually only triggered with values very close to zero.
    
    Closes angular#1469
    bshepherdson committed Oct 19, 2012
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