Test cases from Cowlishaw, v2.57. All are pased cleanly.
diff --git a/Lib/test/decimaltestdata/dsEncode.decTest b/Lib/test/decimaltestdata/dsEncode.decTest
index 185ddc7..7e72d4b 100644
--- a/Lib/test/decimaltestdata/dsEncode.decTest
+++ b/Lib/test/decimaltestdata/dsEncode.decTest
@@ -18,7 +18,7 @@
 --   mfc@uk.ibm.com                                                   --

 ------------------------------------------------------------------------

 -- [Previously called decimal32.decTest]

-version: 2.56

+version: 2.57

 

 -- This set of tests is for the four-byte concrete representation.

 -- Its characteristics are:

@@ -367,3 +367,6 @@
 decs786 apply   #225002ff       -> 999

 decs787 apply   #225003ff       -> 999

 

+-- narrowing case

+decs790 apply 2.00E-99 -> #00000100 Subnormal

+decs791 apply #00000100 -> 2.00E-99 Subnormal