fbc headers: ./inc/fblimits.bi

- adjust constant value MIN_VALUE_DOUBLE and MAX_VALUE_DOUBLE
- somewhere in the conversion from literal value in source to double floating
  point value in memory there is a slight difference between windows/linux
  and DOS ports where the DOS port was overflowing the precision.
- the adjustment appears to be valid on windows/linux/dos and since the
  decimal floating point representation as a literal is an approximation
  the adjustment should be still be acceptable to initialize the internal
  max floating point values.

Author: jayrm

Diff for: inc/fblimits.bi

@@ -112,8 +112,8 @@ namespace FB
 		MAX_VALUE_SINGLE = 3.402823466e+38
 
 	const as double _
-		MIN_VALUE_DOUBLE = -1.7976931348623158E+308#, _
-		MAX_VALUE_DOUBLE = 1.7976931348623158E+308#
+		MIN_VALUE_DOUBLE = -1.7976931348623157E+308#, _
+		MAX_VALUE_DOUBLE = 1.7976931348623157E+308#
 
 #if __FB_LANG__ = "fb"
 end namespace

Diff for: tests/numbers/limits.bas

@@ -18,7 +18,7 @@
 	#define max_int(T) cast(T, iif(is_signed(T), max_signed(T), max_unsigned(T)))
 	#define max_single(T) cast(T, iif(is_single(T), 3.402823466e+38, 0))
 	#define min_single(T) cast(T, -max_single(T))
-	#define max_double(T) cast(T, iif(is_double(T), 1.7976931348623158D+308#, 0#))
+	#define max_double(T) cast(T, iif(is_double(T), 1.7976931348623157D+308#, 0#))
 	#define min_double(T) cast(T, -max_double(T))
 	#define max_float(T) cast(T, iif(is_single(T), max_single(T), max_double(T)))
 	#define min_float(T) cast(T, iif(is_single(T), min_single(T), min_double(T)))