Suspected implicit conversion errors

[Ljiee]

At line 524 and 526 of sqlite/src/func.c, clang10 complains that
"error: implicit conversion from 'long long' to 'double' changes value from 9223372036854775806 to 9223372036854775808
if( n==0 && r>=0 && r<LARGEST_INT64-1 ){ "
“error: implicit conversion from 'long long' to 'double' changes value from 9223372036854775806 to 9223372036854775808 }
else if( n==0 && r<0 && (-r)<LARGEST_INT64-1 ){”

The source code is

 if( n==0 && r>=0 && r<LARGEST_INT64-1 ){
    r = (double)((sqlite_int64)(r+0.5));
  }else if( n==0 && r<0 && (-r)<LARGEST_INT64-1 )
    r = -(double)((sqlite_int64)((-r)+0.5));

if r is 9223372036854775806.9, there might be a risk of overflow.

In fact, SQLite has already changed its code, please reference mackyle/sqlite@26b1526.

Similarly, at line 264 of lua/ltypes.c, clang10 also reports a compilation error:
"error: implicit conversion from 'long long' to 'double' changes value from 9223372036854775807 to 9223372036854775808 [-Werror,-Wimplicit-int-float-conversion]
dbl:if (darg < LLONG_MIN || darg > LLONG_MAX)".
The source code is

    dbl:if (darg < LLONG_MIN || darg > LLONG_MAX)
 265             luaL_error(lua, "conversion to: int failed from: %f", darg);
 266         *val= (long long) darg;
 267         return;

If darg is 9223372036854775807.5(could this happen?), there might be a risk of overflow.