new Date(NaN) sets the date to the default date instead of an invalid date

[raskad]

Describe the bug
When new Date(NaN) is called, the date is being set to the default date, instead to an invalid date.

To Reproduce

This JavaScript code reproduces the issue:

new Date(NaN).toString()

The code returns "Thu Jan 01 1970 01:00:00 GMT+01:00"

Expected behavior
The code should return "Invalid Date"

Build environment:

• OS: Linux
• Version: 17c412f
• Target triple: x86_64-unknown-linux-gnu
• Rustc version: rustc 1.53.0 (53cb7b09b 2021-06-17)