1115067 - Rounding error using Uint8ClampedArray

Status: RESOLVED INVALID

(Firefox :: Untriaged, defect)

Description

[Epistemex]

User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:35.0) Gecko/20100101 Firefox/35.0
Build ID: 20141218174327

Steps to reproduce:

Setting an value with decimal x.5 in an Uint8ClampedArray rounds in the wrong direction:

    var ca = new Uint8ClampedArray(1);
    ca[0] = 100.5;



Actual results:

    console.log(ca[0]); // => 100, should be 101

    ca[0] = 100.51;     // min. trigger value: 100.50000000000001
    console.log(ca[0]); // => 101, correct

See http://jsfiddle.net/epistemex/7bak3dLd/


Expected results:

It should round any decimal value equal to x.5 or higher up to next integer value.
The rounding process seem to be checking decimals like "> .5" instead of ">= .5".

Comment 1

[Epistemex]

(or < .5).

I see that in the ES6 draft, if the touint8clamp function is used here, it's suppose to use even tie instead of rounding up IIUC. This would be mathematically incorrect in any instance imo, and I cannot see the logic reasoning for using this approach here?