std.rational?

[MrSmith]

This code fails:

rational(0, 1) * rational(1, 1);


object.Error: Integer Divide by Zero
----------------
0x00408228 in int std.rational.gcf!(int, int).gcf(int, int) at 
C:\rational\rational.d(878)
0x0040820A in int std.rational.gcf!(int, int).gcf(int, int) at 
C:\rational\rational.d(870)
0x004082E7 in std.rational.Rational!(int).Rational 
std.rational.Rational!(int).Rational.opOpAssign!("*", 
std.rational.Rational!(int).Rational).opOpAssign(std.rational.Rational!(int).Rational) 
at C:\rational\rational.d(235)
0x004087C3 in std.rational.Rational!(int).Rational 
std.rational.Rational!(int).Rational.opBinary!("*", 
std.rational.Rational!(int).Rational).opBinary(std.rational.Rational!(int).Rational) 
at C:\rational\rational.d(218)
0x0040880C in _Dmain at C:\rational\test.d(8)
0x0040C7EC in extern (C) int rt.dmain2._d_run_main(int, char**, 
extern (C) int function(char[][])*).void runMain()
0x0040C827 in extern (C) int rt.dmain2._d_run_main(int, char**, 
extern (C) int function(char[][])*).void runAll()
0x0040C425 in _d_run_main
0x0040A064 in main
0x769C33AA in BaseThreadInitThunk
0x77C19EF2 in RtlInitializeExceptionChain
0x77C19EC5 in RtlInitializeExceptionChain
----------------

It seems to me like gcf is not properly implemented. Also why its 
name is gcf (greatest common factor) and not gcd (greatest common 
divisor)?