How HP48 ASCII headers are supposed to work

[vcolella]

I'm kinda of a noob trying to understand some UserRPL bugs in order to fix them.

The bug in question happens in a program that stores equations as strings to later retrieve them.

The header used in the original program is :

Code:

%%HP: T(3)A(R)F(.);

The bug happens when evaluating an equation with arguments in a calculator set with

Code:

F(,)

Consider this program:

Code:


%%HP: T(3)A(R)F(.);
\<<
'\.S(-1, 1, x, x)'
\>>

If I transfer it to the calculator, I get a STR\-> Error because the argument separator doesn't match the expected ";".

However, if I manually type the program in the calculator and leave it in the stack, the argument separator correctly changes when the fraction mark changes (FLG 51):

   
   

   
   

As I understand, the calculator correctly changes the argument separator for program object types but not for strings, which is how programs are transferred to the calculator.

So what I want to know is: isn't that the whole point of the header ? Shouldn't it tell the calculator how to parse the incoming program in string form ? Otherwise, what's the point of it ?

Sorry for the long post and thank you in advance to anyone who can shed a light on this.