According to the documentation on primitives, 1.7976931348623158e+308 is the maximum value of a double. However, formatInt(1.7976931348623158e+308, "e") will print "inf". (Doing some brute-force testing, if the latest digit there is anything higher than 5, "inf" will be the result.)

According to this C++ reference, the maximum double value is 1.79769e+308. Where did you get the value as documented? Could it be non-portable (e.g. works on Windows, but is technically higher than the max)?

Thank you.

Confirmed that print(formatFloat(1.7976931348623158e+308, "e")); returns "2e+308" when locally modified asStringScanDouble to return strtod(string, NULL); instead of return value;

Would it make sense to use some of the platform ifdefs from as_config.h and use strtod on platforms where it's available?

double asStringScanDouble(const char *string, size_t *numScanned)
{
    char* endptr = NULL;
    double value = strtod(string, &endptr);

    if( numScanned )
        *numScanned = endptr - string;

    return value;
}

Or perhaps use the actual source (e.g. http://www.opensource.apple.com/source/tcl/tcl-10/tcl/compat/strtod.c)

For what it's worth I tried strod() on linux and that worked fine (I imagine that may be a closer implementation to Apple's).

But I think your change is fine.