Unserialize from Carbon v2 objects

[Kyle]

Related to #3002

Running with Carbon v2:

echo serialize(Carbon::parse('-2 months')->diffAsCarbonInterval());

We obtain:

O:21:"Carbon\CarbonInterval":22:{s:1:"y";i:0;s:1:"m";i:2;s:1:"d";i:0;s:1:"h";i:0;s:1:"i";i:0;s:1:"s";i:0;s:1:"f";d:5.4E-5;s:6:"invert";i:0;s:4:"days";b:0;s:11:"from_string";b:0;s:9:" * tzName";N;s:7:" * step";N;s:22:" * localMonthsOverflow";N;s:21:" * localYearsOverflow";N;s:25:" * localStrictModeEnabled";N;s:24:" * localHumanDiffOptions";N;s:22:" * localToStringFormat";N;s:18:" * localSerializer";N;s:14:" * localMacros";N;s:21:" * localGenericMacros";N;s:22:" * localFormatFunction";N;s:18:" * localTranslator";N;}

Then when running in Carbon v3:

unserialize($string); // $string being the serialized data above

It chokes on tzName (which has been renamed timezoneSetting)

Carbon version: 3.3.1

PHP version: 8.3

[Kyle]

There are similar issues with CarbonPeriod unserialization. However Carbon, CarbonImmutable and CarbonTimeZone are fine.