[metapost] augment drawoptions

[Stephan Hennig]

Taco Hoekwater schrieb:
> 
> Stephan Hennig wrote:
>> 
>> As can be seen macros _op_stack_A to _op_stack_C are defined, but empty,
>> whereas _op_stack_D is of type "tag".  Is there a way to completely
>> remove a macro, i.e., make an identifier a tag again?
> 
>    save <macro>;

But does that save memory?  I mean, the original macro definition seems
to be saved (preserved) by save?

Best regards,
Stephan Hennig