Implement dirty flag, to prepare for reinstating primitive object optimization
-rw-r--r-- 19 .gitignore
-rw-r--r-- 435 Mutex.mjs
-rwxr-xr-x 301 a.mjs
-rwxr-xr-x 355 b.mjs
-rw-r--r-- 12614 logjson.mjs
-rw-r--r-- 15262 random.json