Eu tenho esse cenário, o arquivo é t.ts:

interface Itest{
   (event: any, ...args: any[]):any;
   }

   var t1: Itest = function (testparam) { return true;};
   var t2: Itest = function (testparam, para1) { return true; };
   var t3: Itest = function (testparam, para1, para2) { return true; };


   interface Itest2 {
     (event: any, para1,...args: any[]): any;
   }
   var t4: Itest2 = function (testparam, para1) { return true; };
   var t5: Itest2 = function (testparam, para1, para2) { return true; };

Quando eu compilo isso com o tsc 0.9.5 eu recebo os seguintes erros:

tsc --target ES5  "t.ts"  
t.ts(6,8): error TS2012: Cannot convert '(testparam: any, para1: any) => boolean' to 'Itest':
    Call signatures of types '(testparam: any, para1: any) => boolean' and 'Itest' are incompatible:
        Call signature expects 1 or fewer parameters.
t.ts(7,8): error TS2012: Cannot convert '(testparam: any, para1: any, para2: any) => boolean' to 'Itest':
    Call signatures of types '(testparam: any, para1: any, para2: any) => boolean' and 'Itest' are incompatible:
        Call signature expects 1 or fewer parameters.
t.ts(14,8): error TS2012: Cannot convert '(testparam: any, para1: any, para2: any) => boolean' to 'Itest2':
    Call signatures of types '(testparam: any, para1: any, para2: any) => boolean' and 'Itest2' are incompatible:
        Call signature expects 2 or fewer parameters.

Estou faltando alguma coisa ou isso está quebrado? Ele costumava trabalhar em 0.9.1.1. obrigado!