core.math.rndtonl is declared as this:
extern (C) real rndtonl(real x);yet it's description says: "...If the integer value of x is greater than long.max, the result is indeterminate."
it looks like it either should return `long`, or this part of description was copypasted from `rndtol`. and if it *really* has such limitation, but returns `real`, i think it should be clarified in documentation, 'cause right now it is somewhat confusing.
