Template Parameter Deduction

[Paul D Anderson via Digitalmars-d-learn]

This used to work in D2.065:

given

1) public T mul(T)(in T x, in T y,
     Context context = T.context) if (isDecimal!T)
     // one template parameter for the two input values

and

2) public T mul(T, U)(in T x, U n, Context context = T.context)
     if (isDecimal!T && isIntegral!U)
     // two different template parameters for the two input values

then

3) dec9 arg1 = dec9("1.20");
    long arg2 = 3;
    result = mul(arg1, arg2);
    // correctly deduced function

But now (D2.066.1) either 1) has to be changed to

1) public T mul(T, U)(in T x, U y, Context context = T.context)
     if (isDecimal!T && isDecimal!U)
     // two identical template parameters for the two input values

or 3) has to be changed to

3) dec9 arg1 = dec9("1.20");
    long arg2 = 3;
    result = mul!(dec9,long)(arg1, arg2);
    // template parameters have to be made explicit

Is this expecded behavior?

Paul