Description:
------------
After calling `NumberFormatter::parse()` with an invalid string, cloning the NumberFormatter instance throws a Fatal Error:

$format = new NumberFormatter('en_US', NumberFormatter::DECIMAL);
$format->parse('abc');
clone $format;

Fatal error: Uncaught Exception: Failed to clone NumberFormatter object

https://3v4l.org/XGVWZ

This seems to only occur with PHP 8.0+. Since `parse()` returns false on error, I wouldn't expect it to invalidate the object.

I was not sure what category this bug report falls under.