util: use ES2015+ Object.is to check negative zero

Use `Object.is` to check whether the value is negative zero or not.

Ref: b3e4fc6
PR-URL: #11332
Reviewed-By: Ben Noordhuis <[email protected]>
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: Evan Lucas <[email protected]>
Reviewed-By: Joyee Cheung <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Sakthipriyan Vairamani <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>

Author: shinnn

lib/util.js

@@ -604,9 +604,8 @@ function formatValue(ctx, value, recurseTimes) {
 
 
 function formatNumber(ctx, value) {
-  // Format -0 as '-0'. Strict equality won't distinguish 0 from -0,
-  // so instead we use the fact that 1 / -0 < 0 whereas 1 / 0 > 0 .
-  if (value === 0 && 1 / value < 0)
+  // Format -0 as '-0'. Strict equality won't distinguish 0 from -0.
+  if (Object.is(value, -0))
     return ctx.stylize('-0', 'number');
   return ctx.stylize('' + value, 'number');
 }