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Issue 907971 link

Starred by 1 user
Status: WontFix
Owner: ----
Closed: Nov 23
EstimatedDays: ----
NextAction: ----
OS: Mac
Pri: 2
Type: Bug



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Long number calculate error on DevTools(F12) panel

Reported by tliang1...@gmail.com, Nov 23 
UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36

Steps to reproduce the problem:
1. open DevTools Console
2. input 187214665202985356, enter
3. output: 187214665202985340

ps: it also error on DevTools Network Preview panel for json response

What is the expected behavior?

What went wrong?
calculate error

Did this work before? N/A 

Chrome version: 70.0.3538.102  Channel: stable
OS Version: OS X 10.13.1
Flash Version:
QQ20181123-134639@2x.png
45.2 KB View Download

Comment 1 by woxxom@gmail.com, Nov 23 

Your number has more than 16 digits in the mantissa part,
which is the limit of JavaScript numbers in IEEE 754 format.

While technically this is not a bug, but behaviorally it appears as one.
It might make sense for Chrome to display such numbers in exponential notation:
1.872146652029853e17

If you want more precision, you can use BigInt in new Chrome by adding "n" suffix:
187214665202985356n

Comment 2 by dtapu...@chromium.org, Nov 23

Status: WontFix (was: Unconfirmed)
The toString functionality is also covered in the ecmascript spec and Chrome is compliant so I don't think we want to change how exponential notation changes.
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