parser: Document number checksum on Estonian ID Cards is "<"

[mjl]

Estonian ID Cards seem to (sometimes? I've only had one in my data set so far!) set the document number checksum to "<", which seems to indicate no checksum.

I have not found anything in the standards for using the "<" in checksums though. Is this something you have seen before?

[Arg0s1080]

Hi @mjl

First of all, excuse me the delay for the reply (I need more time to live xD. I really came here because someone who opened an issue yesterday sent me a mailing with a sensationalist title ["Big crush with MRZ" or something like that] and it worked!)

Yes, I had already seen it before especially in the jungle of ID cards.

Two cases occur to me:
.- String is greater than the field and someone decides to occupy the checksum with "<"
.- Checksum == 0 and someone decides to replace "0" by "<"

BR