Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
fully updated to the latests Decimal Specification (v1.66) and the
latests test cases (v2.56).
Thanks to Mark Dickinson for all his help during this process.
diff --git a/Lib/test/decimaltestdata/nextminus.decTest b/Lib/test/decimaltestdata/nextminus.decTest
new file mode 100644
index 0000000..200580d
--- /dev/null
+++ b/Lib/test/decimaltestdata/nextminus.decTest
@@ -0,0 +1,148 @@
+------------------------------------------------------------------------
+-- nextminus.decTest -- decimal next that is less [754r nextdown] --
+-- Copyright (c) IBM Corporation, 1981, 2007. All rights reserved. --
+------------------------------------------------------------------------
+-- Please see the document "General Decimal Arithmetic Testcases" --
+-- at http://www2.hursley.ibm.com/decimal for the description of --
+-- these testcases. --
+-- --
+-- These testcases are experimental ('beta' versions), and they --
+-- may contain errors. They are offered on an as-is basis. In --
+-- particular, achieving the same results as the tests here is not --
+-- a guarantee that an implementation complies with any Standard --
+-- or specification. The tests are not exhaustive. --
+-- --
+-- Please send comments, suggestions, and corrections to the author: --
+-- Mike Cowlishaw, IBM Fellow --
+-- IBM UK, PO Box 31, Birmingham Road, Warwick CV34 5JL, UK --
+-- mfc@uk.ibm.com --
+------------------------------------------------------------------------
+version: 2.56
+
+extended: 1
+precision: 9
+rounding: half_up
+maxExponent: 384
+minexponent: -383
+
+nextm001 nextminus 0.999999995 -> 0.999999994
+nextm002 nextminus 0.999999996 -> 0.999999995
+nextm003 nextminus 0.999999997 -> 0.999999996
+nextm004 nextminus 0.999999998 -> 0.999999997
+nextm005 nextminus 0.999999999 -> 0.999999998
+nextm006 nextminus 1.00000000 -> 0.999999999
+nextm007 nextminus 1.0 -> 0.999999999
+nextm008 nextminus 1 -> 0.999999999
+nextm009 nextminus 1.00000001 -> 1.00000000
+nextm010 nextminus 1.00000002 -> 1.00000001
+nextm011 nextminus 1.00000003 -> 1.00000002
+nextm012 nextminus 1.00000004 -> 1.00000003
+nextm013 nextminus 1.00000005 -> 1.00000004
+nextm014 nextminus 1.00000006 -> 1.00000005
+nextm015 nextminus 1.00000007 -> 1.00000006
+nextm016 nextminus 1.00000008 -> 1.00000007
+nextm017 nextminus 1.00000009 -> 1.00000008
+nextm018 nextminus 1.00000010 -> 1.00000009
+nextm019 nextminus 1.00000011 -> 1.00000010
+nextm020 nextminus 1.00000012 -> 1.00000011
+
+nextm021 nextminus -0.999999995 -> -0.999999996
+nextm022 nextminus -0.999999996 -> -0.999999997
+nextm023 nextminus -0.999999997 -> -0.999999998
+nextm024 nextminus -0.999999998 -> -0.999999999
+nextm025 nextminus -0.999999999 -> -1.00000000
+nextm026 nextminus -1.00000000 -> -1.00000001
+nextm027 nextminus -1.0 -> -1.00000001
+nextm028 nextminus -1 -> -1.00000001
+nextm029 nextminus -1.00000001 -> -1.00000002
+nextm030 nextminus -1.00000002 -> -1.00000003
+nextm031 nextminus -1.00000003 -> -1.00000004
+nextm032 nextminus -1.00000004 -> -1.00000005
+nextm033 nextminus -1.00000005 -> -1.00000006
+nextm034 nextminus -1.00000006 -> -1.00000007
+nextm035 nextminus -1.00000007 -> -1.00000008
+nextm036 nextminus -1.00000008 -> -1.00000009
+nextm037 nextminus -1.00000009 -> -1.00000010
+nextm038 nextminus -1.00000010 -> -1.00000011
+nextm039 nextminus -1.00000011 -> -1.00000012
+
+-- input operand is >precision
+nextm041 nextminus 1.00000010998 -> 1.00000010
+nextm042 nextminus 1.00000010999 -> 1.00000010
+nextm043 nextminus 1.00000011000 -> 1.00000010
+nextm044 nextminus 1.00000011001 -> 1.00000011
+nextm045 nextminus 1.00000011002 -> 1.00000011
+nextm046 nextminus 1.00000011002 -> 1.00000011
+nextm047 nextminus 1.00000011052 -> 1.00000011
+nextm048 nextminus 1.00000011552 -> 1.00000011
+nextm049 nextminus -1.00000010998 -> -1.00000011
+nextm050 nextminus -1.00000010999 -> -1.00000011
+nextm051 nextminus -1.00000011000 -> -1.00000012
+nextm052 nextminus -1.00000011001 -> -1.00000012
+nextm053 nextminus -1.00000011002 -> -1.00000012
+nextm054 nextminus -1.00000011002 -> -1.00000012
+nextm055 nextminus -1.00000011052 -> -1.00000012
+nextm056 nextminus -1.00000011552 -> -1.00000012
+-- ultra-tiny inputs
+nextm060 nextminus 1E-99999 -> 0E-391
+nextm061 nextminus 1E-999999999 -> 0E-391
+nextm062 nextminus 1E-391 -> 0E-391
+nextm063 nextminus -1E-99999 -> -1E-391
+nextm064 nextminus -1E-999999999 -> -1E-391
+nextm065 nextminus -1E-391 -> -2E-391
+
+-- Zeros
+nextm100 nextminus -0 -> -1E-391
+nextm101 nextminus 0 -> -1E-391
+nextm102 nextminus 0.00 -> -1E-391
+nextm103 nextminus -0.00 -> -1E-391
+nextm104 nextminus 0E-300 -> -1E-391
+nextm105 nextminus 0E+300 -> -1E-391
+nextm106 nextminus 0E+30000 -> -1E-391
+nextm107 nextminus -0E+30000 -> -1E-391
+
+precision: 9
+maxExponent: 999
+minexponent: -999
+-- specials
+nextm150 nextminus Inf -> 9.99999999E+999
+nextm151 nextminus -Inf -> -Infinity
+nextm152 nextminus NaN -> NaN
+nextm153 nextminus sNaN -> NaN Invalid_operation
+nextm154 nextminus NaN77 -> NaN77
+nextm155 nextminus sNaN88 -> NaN88 Invalid_operation
+nextm156 nextminus -NaN -> -NaN
+nextm157 nextminus -sNaN -> -NaN Invalid_operation
+nextm158 nextminus -NaN77 -> -NaN77
+nextm159 nextminus -sNaN88 -> -NaN88 Invalid_operation
+
+-- Nmax, Nmin, Ntiny, subnormals
+nextm170 nextminus 9.99999999E+999 -> 9.99999998E+999
+nextm171 nextminus 9.99999998E+999 -> 9.99999997E+999
+nextm172 nextminus 1E-999 -> 9.9999999E-1000
+nextm173 nextminus 1.00000000E-999 -> 9.9999999E-1000
+nextm174 nextminus 9E-1007 -> 8E-1007
+nextm175 nextminus 9.9E-1006 -> 9.8E-1006
+nextm176 nextminus 9.9999E-1003 -> 9.9998E-1003
+nextm177 nextminus 9.9999999E-1000 -> 9.9999998E-1000
+nextm178 nextminus 9.9999998E-1000 -> 9.9999997E-1000
+nextm179 nextminus 9.9999997E-1000 -> 9.9999996E-1000
+nextm180 nextminus 0E-1007 -> -1E-1007
+nextm181 nextminus 1E-1007 -> 0E-1007
+nextm182 nextminus 2E-1007 -> 1E-1007
+
+nextm183 nextminus -0E-1007 -> -1E-1007
+nextm184 nextminus -1E-1007 -> -2E-1007
+nextm185 nextminus -2E-1007 -> -3E-1007
+nextm186 nextminus -10E-1007 -> -1.1E-1006
+nextm187 nextminus -100E-1007 -> -1.01E-1005
+nextm188 nextminus -100000E-1007 -> -1.00001E-1002
+nextm189 nextminus -1.0000E-999 -> -1.00000001E-999
+nextm190 nextminus -1.00000000E-999 -> -1.00000001E-999
+nextm191 nextminus -1E-999 -> -1.00000001E-999
+nextm192 nextminus -9.99999998E+999 -> -9.99999999E+999
+nextm193 nextminus -9.99999999E+999 -> -Infinity
+
+-- Null tests
+nextm900 nextminus # -> NaN Invalid_operation
+