typeof null

a.js

function f() { return typeof null === "object"; }

console.log(f());

// for (var i = 0; i < 10000; i++) f();
%OptimizeFunctionOnNextCall(f);

console.log(f());

console.log(process.versions.v8)

a.sh

for v in v4.2.5 v4.2.6 v4.3.0 v4.3.1 v4.3.2 v4.4.0 v4.4.1 v4.4.2 v4.4.3 v4.4.4 v4.4.5 v5.0.0 v5.1.0 v5.1.1 v5.2.0 v5.3.0 v5.4.0 v5.4.1 v5.5.0 v5.6.0 v5.7.0 v5.7.1 v5.8.0 v5.9.0 v5.9.1 v5.10.0 v5.10.1 v5.11.0 v5.11.1 v6.0.0 v6.1.0 v6.2.0 v6.2.1 v6.2.2 ; do
  echo === $v ===
  # wget -q https://nodejs.org/dist/$v/node-$v-linux-x64.tar.gz
  # tar zxpf node-$v-linux-x64.tar.gz
  node-$v-linux-x64/bin/node --allow-natives-syntax a.js
done

a.txt

=== v4.2.5 ===
true
true
4.5.103.35
=== v4.2.6 ===
true
true
4.5.103.35
=== v4.3.0 ===
true
true
4.5.103.35
=== v4.3.1 ===
true
true
4.5.103.35
=== v4.3.2 ===
true
true
4.5.103.35
=== v4.4.0 ===
true
true
4.5.103.35
=== v4.4.1 ===
true
true
4.5.103.35
=== v4.4.2 ===
true
true
4.5.103.35
=== v4.4.3 ===
true
true
4.5.103.35
=== v4.4.4 ===
true
true
4.5.103.35
=== v4.4.5 ===
true
true
4.5.103.35
=== v5.0.0 ===
true
true
4.6.85.28
=== v5.1.0 ===
true
true
4.6.85.31
=== v5.1.1 ===
true
true
4.6.85.31
=== v5.2.0 ===
true
true
4.6.85.31
=== v5.3.0 ===
true
true
4.6.85.31
=== v5.4.0 ===
true
true
4.6.85.31
=== v5.4.1 ===
true
true
4.6.85.31
=== v5.5.0 ===
true
true
4.6.85.31
=== v5.6.0 ===
true
true
4.6.85.31
=== v5.7.0 ===
true
true
4.6.85.31
=== v5.7.1 ===
true
true
4.6.85.31
=== v5.8.0 ===
true
true
4.6.85.31
=== v5.9.0 ===
true
true
4.6.85.31
=== v5.9.1 ===
true
true
4.6.85.31
=== v5.10.0 ===
true
true
4.6.85.31
=== v5.10.1 ===
true
true
4.6.85.31
=== v5.11.0 ===
true
true
4.6.85.31
=== v5.11.1 ===
true
true
4.6.85.31
=== v6.0.0 ===
true
false
5.0.71.35
=== v6.1.0 ===
true
false
5.0.71.35
=== v6.2.0 ===
true
false
5.0.71.47
=== v6.2.1 ===
true
false
5.0.71.52
=== v6.2.2 ===
true
false
5.0.71.52