fix decimal parsing

Author: 9il

source/mir/bignum/decimal.d

@@ -349,7 +349,6 @@ struct Decimal(size_t maxSize64)
  return true;
  }
  }
- key = cast(DecimalExponentKey)d;
  static if (allowUnderscores)
  {
  if (recentUnderscore)
@@ -358,6 +357,7 @@ struct Decimal(size_t maxSize64)
  switch (d)
  {
  case DecimalExponentKey.dot:
+ key = DecimalExponentKey.dot;
  if (_expect(dot, false))
  break;
  dot = true;
@@ -388,6 +388,7 @@ struct Decimal(size_t maxSize64)
  case DecimalExponentKey.e:
  case DecimalExponentKey.E:
  import mir.parse: parse;
+ key = cast(DecimalExponentKey)d;
  if (parse(str, exponent) && str.length == 0)
  goto E;
  break;
@@ -468,6 +469,10 @@ struct Decimal(size_t maxSize64)
  assert(key == DecimalExponentKey.e);
  assert(cast(double) decimal == 0.334e-5);
 
+ assert(decimal.fromStringImpl("100_000_000"w, key));
+ assert(key == DecimalExponentKey.none);
+ assert(cast(double) decimal == 1e8);
+
  assert(decimal.fromStringImpl("-334D-5"d, key));
  assert(key == DecimalExponentKey.D);
  assert(cast(double) decimal == -334e-5);

source/mir/bignum/low_level_view.d

@@ -2205,7 +2205,6 @@ struct DecimalView(W, WordEndian endian = TargetEndian, Exp = sizediff_t)
 
  continue;
  }
- key = cast(DecimalExponentKey)d;
  static if (allowUnderscores)
  {
  if (recentUnderscore)
@@ -2214,6 +2213,7 @@ struct DecimalView(W, WordEndian endian = TargetEndian, Exp = sizediff_t)
  switch (d)
  {
  case DecimalExponentKey.dot:
+ key = DecimalExponentKey.dot;
  if (_expect(dot, false))
  break;
  dot = true;
@@ -2244,6 +2244,7 @@ struct DecimalView(W, WordEndian endian = TargetEndian, Exp = sizediff_t)
  case DecimalExponentKey.e:
  case DecimalExponentKey.E:
  import mir.parse: parse;
+ key = cast(DecimalExponentKey)d;
  if (parse(str, exponent) && str.length == 0)
  {
  if (t != 1)