Added comment and formatting changes mainly to overcome damage done by

merges.

src/BTrees/BTreeTemplate.c

@@ -724,7 +724,8 @@ _BTree_set(BTree *self, PyObject *keyarg, PyObject *value,
         }
     }
 
-  if (status == 2) {  /*  this is the last reference to child status */
+  if (status == 2) {
+    /* The child must be a BTree because bucket.set never returns 2 */
     /* Two problems to solve:  May have to adjust our own firstbucket,
      * and the bucket that went away needs to get unlinked.
      */
@@ -765,8 +766,8 @@ _BTree_set(BTree *self, PyObject *keyarg, PyObject *value,
    * But first, if we're a bottom-level node, we've got more bucket-fiddling
    * to set up.
    */
-  if (!SameType_Check(self, d->child)) {
-    /* We're about to delete a bucket. */
+  if (! SameType_Check(self, d->child)) {
+    /* We're about to delete a bucket, so need to adjust bucket pointers. */
     if (min) {
       /* It's not our first bucket, so we can tell the previous
        * bucket to adjust its reference to it.  It can't be anyone