perf(internal): use strict equality for isObject() (#4493)

bmeurer · benlesh · commit fc84a00ecd9e · 2019-01-24T15:16:02.000-08:00
In `isObject(x)` use triple equal instead of double equal comparison
with `null`, since `undefined` will be ruled out via the `typeof`, and
therefore it's sufficient to just check for `null` initially.
diff --git a/src/internal/util/isObject.ts b/src/internal/util/isObject.ts
@@ -1,3 +1,3 @@
 export function isObject(x: any): x is Object {
-  return x != null && typeof x === 'object';
+  return x !== null && typeof x === 'object';
 }

Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,3 @@`
`1`	`1`	`export function isObject(x: any): x is Object {`
`2`		`- return x != null && typeof x === 'object';`
	`2`	`+ return x !== null && typeof x === 'object';`
`3`	`3`	`}`