A session's evaluated modules are recorded as never unmapped

TODO.org

@@ -1545,6 +1545,10 @@ out the first element typing the rest.
 
 * Dev loop
 
+** TODO Every evaluated expression leaves its module mapped
+Each C-x C-e loads its own =.so= and never unloads it, so a session's mapping count
+grows by about four per evaluation; the kernel's limit (65530) ends a long session.
+
 ** TODO A prelude function shadowed live is reached by the prelude's own calls
 A defn of a prelude function's name sent to a running =flan dev= installs into the
 host's cell for that name, so the prelude's calls compiled into the host follow it;