Guaranteed Attributes for Various IDs

Guaranteed Attributes for Various IDs

Hey everyone,

I’m writing a program that hooks into the Zoho Projects API. I’m looking to store references to some of the ID strings retrieved from various calls.
 
What kind of guarantees are there for various ID string lengths, types, etc? I’m currently interested in User ID, Task ID, Tasklist ID, and ProjectIDs, but am open to having a reference to any other ones available to me. It appears that Task/Tasklist/project IDs always start with a 1, and are 18-19 characters long, while User IDs are always 9 long.
 
Please let me know whatever you can about these pesky identifiers!

Thanks