Thanks. I don't know about who might analyze handwriting styles except for forensics experts working for the FBI. I learned in second grade from the classic letter forms my teacher taped up over the blackboard. Any style I might have is transient and accidental as my usual goal is legible.
Errata: He refers to "series comma" to avoid the "serial killer" association.
I find it unsettling when a noun like "series" is forced into duty as an adjective, when the perfectly good "serial" already exists. (Though surely some writer should publish "The Serial Comma Killer".)
"Only godless savages eschew the series comma."
A sentiment I can wholly support, despite the unsettling adjective.