With reference to the very informative What are Salesforce ID's composed of?, I am wondering what the best value to use for an Id of a specific SObjectType that matches nothing is.
If I understand that link correctly, the Id should be something like:
SObjectType t = ...; Id id = t.getDescribe().getKeyPrefix() + '000' + 'xxxxxxxxx';
But what is a good value to use in place of
'zzzzzzzzz' 'ZZZZZZZZZ' 'ZzZzZzZzZ' '000000AAA' 'NoMatchId' 'xxxxxxxxx'