There’s a thing that’s been bugging me for quite some time now. If you
read Programming Ruby’s section about the object model you will notice
that modules are included by inserting proxy classes between the
class and its superclass; where the proxy class has an “iv_tbl” pointer
pointing to the module. This is implemented as a struct-based linked
in the interpreter, where the name “iv_tbl” pops up again. So my
is: what does the abbreviation iv mean?