Incorrect result when logging subnormal floating-point number to console.

[ealmansi]

• Version: 8.9.1, 8.9.2, 9.x
• Platform: Linux d0cc2382da37 4.4.0-101-generic 124-Ubuntu SMP Fri Nov 10 18:29:59 UTC 2017 x86_64 Linux
• Subsystem: console

Logging a subnormal floating-point number to console prints -0 instead of the correct number when passed as first argument to console.log. It prints the correct number if passed in as the second argument.

Steps to reproduce:

$ node
console.log(-5e-324);
console.log('', -5e-324); 

Expected output:

-5e-324
-5e-324

Actual output:

-0
-5e-324

Additional info:
I tested this code sample and can confirm incorrect output for versions 8.9.1, 8.9.2, and 9.x.
The same code sample produces the expected output in version 8.3.

[ealmansi]

cc @jpdjere

[vsemozhetbyt]

FWIW, the output in the Chrome and Node.js REPL differ here:
Node.js canary with V8 6.5:

> -5e-324
-0
> ' ' + -5e-324
' -5e-324'

Google Chrome 65.0.3286.0:

-5e-324
-5e-324
' ' + -5e-324
" -5e-324"

[devsnek]

this error comes from formatNumber in util.js:

if (-1 / value === -Infinity)
  return fn('-0', 'number');

value === 0 && -1 / value === -Infinity should fix this:

[BridgeAR]

This already got fixed by #17507

Closing