relying on register identity in fact the whole operator concept was geared towards this, using 2 regs instead of one to avoid the whole issue better now
Builtin Testing
At the Module level (word/object/integer) mostly testing that
- functions exist
- they compile
- basic length tests (no "contents")
Minimal tests for risc compilation, and again length only (should be array too)
Functionality is tested by interpreter over in interpreter dir