domenic at domenicdenicola.com (2013-07-26T18:38:51.176Z)
Here's a cute little bug in the ECMAScript spec I discovered when following up the implications of safe integers we were discussing today: 15.8.2.15 Math.round has the following note: The value of *Math.round(x)* is the same as the value of *Math.floor(x+0.5)*, except when *x* is -0 *or* is less than 0 but greater than or equal to -0.5; for these cases *Math.round(x)* returns -0, but *Math.floor(x+0.5)* returns +0. This is false. Math.round(4503599627370497) returns 4503599627370497. Math.floor(4503599627370497+0.5) returns 4503599627370498.
Here's a cute little bug in the ECMAScript spec I discovered when following up the implications of safe integers we were discussing today: 15.8.2.15 Math.round has the following note: The value of *Math.round(x)* is the same as the value of *Math.floor(x+0.5)*, except when *x* is -0* *or* *is less than 0 but greater than or equal to -0.5; for these cases *Math.round(x)* returns -0, but *Math.floor(x+0.5)*returns +0. This is false. Math.round(4503599627370497) returns 4503599627370497. Math.floor(4503599627370497+0.5) returns 4503599627370498. Waldemar -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.mozilla.org/pipermail/es-discuss/attachments/20130725/e6d647ec/attachment.html>