Test cases from Cowlishaw, v2.57. All are pased cleanly.
diff --git a/Lib/test/decimaltestdata/dqEncode.decTest b/Lib/test/decimaltestdata/dqEncode.decTest
index ed3f328..fcb512b 100644
--- a/Lib/test/decimaltestdata/dqEncode.decTest
+++ b/Lib/test/decimaltestdata/dqEncode.decTest
@@ -18,7 +18,7 @@
-- mfc@uk.ibm.com --
------------------------------------------------------------------------
-- [Previously called decimal128.decTest]
-version: 2.56
+version: 2.57
-- This set of tests is for the sixteen-byte concrete representation.
-- Its characteristics are:
@@ -468,3 +468,10 @@
decq829 apply #22080000000000000000000115afb55b -> 4294967295
decq830 apply #22080000000000000000000115afb57a -> 4294967296
decq831 apply #22080000000000000000000115afb57b -> 4294967297
+
+-- VG testcase
+decq840 apply #2080000000000000F294000000172636 -> 8.81125000000001349436E-1548
+decq841 apply #20800000000000008000000000000000 -> 8.000000000000000000E-1550
+decq842 apply #1EF98490000000010F6E4E0000000000 -> 7.049000000000010795488000000000000E-3097
+decq843 multiply #20800000000000008000000000000000 #2080000000000000F294000000172636 -> #1EF98490000000010F6E4E0000000000 Rounded
+