Ballot Secrecy

Voting's a secret. Votes are secret. These I know.
(I still remember the "chant": 投票是神圣的，投票是秘密的。）
It’s easy to find out the number of votes for each party for each polling stations/districts. This I also know.
But I just realize that there are serial numbers on each voting slip.
SO, Would the serial number be tagged to each individual or recorded as it is issued?

Not that I wanted to draw a tortoise or a pig on the voting slip.
Not that I wanted to write something crude or bad in there.
You know I won’t because I am good by nature (also read as “kiasi” ;p) and will never play play with my voting rights.

Anyway, share with you smth written by someone with the nick of "Foreign Talent" in Channelnewsasia Forum:

Scene at Voting Centre:
You hand in you NRIC with the voting card they sent you.
One chap will read out loudly your Name and IC Number,
as though announcing the arrival of a VIP,
Another chap will look into the Register book and ensure that the data
are correct against your NRIC and the voting card.
He then makes a marking against your data and hand you the Voting Slip
which has the serial number, that is also written in one of the columns in the Register book.

Are the above true? I mean the process (written in a comical way though)... ;p

Anyway, enough of all these nonsense... now I know the official answer (in full) to my question.

SO, DON'T PLAY PLAY...