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define *_MAXINT in terms of *_MANT_DIG

--- a/src/builtins.c

+++ b/src/builtins.c

@@ -9,8 +9,8 @@

 #include "table.h"

 #include "nan.h"

-#define DBL_MAXINT (1LL<<53)

-#define FLT_MAXINT (1<<24)

+#define DBL_MAXINT (1LL<<DBL_MANT_DIG)

+#define FLT_MAXINT (1<<FLT_MANT_DIG)

 size_t

 llength(value_t v)

--- a/src/plan9/platform.h

+++ b/src/plan9/platform.h

@@ -76,6 +76,8 @@

 #define INT64_MAX 0x7fffffffffffffffLL

 #define UINT64_MAX 0xffffffffffffffffULL

 #define ULONG_MAX UINT32_MAX

+#define DBL_MANT_DIG 53

+#define FLT_MANT_DIG 24

 #define PATHSEP '/'

 #define PATHSEPSTRING "/"