add some notes about earlier LALR work for future archeologists

TODO

@@ -103,6 +103,18 @@
    course that in a string literal, the former means "\n" and the latter means
    "\n\n".
 
+   relevant commits of this earlier work (from feb 2020) were:
+
+   c316cc89 let 'obj' no longer consume leading whitespace
+   dc0a1189 allow npair to no longer consume leading whitespace
+   31310bb2 remove the TOK() from pnat
+   9b43d1d0 put an explicit delimiter after all occurances of npair
+   9dcf3ddc remove the TOK() from 'nat'
+   f7dbb2ac make whitespace explicit in arrays and dictionaries
+   00f48306 remove all uses of TOK() from object syntax
+   25596aec make robj LALR
+   1d031337 intermediate commit: work towards making all of 'obj' LALR
+
  - implement random-access ("island") parser (walking objects from /Root).
    i'm not sure how much we need to know about the "DOM" for this. maybe
    nothing? since everything is built out of basic objects and we can just