Interface update, per-method Contexts.

filter/txnBuf/doc.go

Index: filter/txnBuf/doc.go
diff --git a/filter/txnBuf/doc.go b/filter/txnBuf/doc.go
index b20dba4a22f953ad46a327a58a0cc3781886cc54..66296376247238505204afd7ee5453755b55d8aa 100644
--- a/filter/txnBuf/doc.go
+++ b/filter/txnBuf/doc.go
@@ -73,4 +73,10 @@
 //   - The changing of namespace inside of a transaction is undefined... This is
 //     just generally a terrible idea anyway, but I thought it was worth
 //     mentioning.
+//
+//   - Currently, the soft transactions are not directly accessible using the
+//     CurrentTransaction interface; it returns the wrapped datastore's
+//     transaction. While this is still correct, it could definitely be made
+//     more useful by adding transaction buffer metadata to the returned
+//     object.
 package txnBuf