[Webkit-unassigned] [Bug 80009] Setting '0.6' to the value of a range input makes the value 0.6000000000000001

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=80009





--- Comment #2 from Kent Tamura <tkent at chromium.org>  2012-03-16 03:41:05 PST ---
(In reply to comment #1)
> This issue looks to be because of wrong step factor representation in double value. Here step factor is "0.1" when it is converted from string to double it is represented as "0.10000000000000001".
> 
> Can anyone please confirm whether it is related to representation error mentioned here http://www.network-theory.co.uk/docs/pytut/RepresentationError.html.

Yeah, this is caused by the representation error in IEEE754.
We should update RangeInputType::sanitizeValue() like:

  If proposedValue satisfies min/max/step restrictions,
    return proposedValue
  return serializeForNumberType(StepRange(element()).clampValue(proposedValue));

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