Advice on ST-Object data-structure setup

[ken . dickey]

Greetings,

I am looking at porting a toy Smalltalk-in-Scheme implementation to 
Guile.

[Note https://github.com/KenDickey/Crosstalk ].

The idea is for simplicity first, then making into a module and 
potentially evolving Smalltalk into a supported, compiled ",language" in 
the Guile way.

The first bit of business is to get the mechanics working.  For this I 
need to have an St-Object which is basically a Vector but which answers 
#false to vector? and #true to st-object?

[Note https://github.com/KenDickey/Crosstalk/blob/master/st-kernel.scm ]

I note that one might change the T7 type-tag from 0x0d (vector) to 0x6d 
(currently unused) with a quick bitwise-or, but would like some advice 
on the best way to do this or some alternate.  I would prefer to work in 
Scheme, not C, BTW.

Any hints appreciated.

Thanks much,
-KenD