worker panic when arg is int64 type

[tt67wq]

when I pass a int64 arg to worker

panic: reflect: Call using float64 as type int64

goroutine 75 [running]:
reflect.Value.call(0xd1fca0, 0xecb8c0, 0x13, 0xe63490, 0x4, 0xc420172660, 0x4, 0x4, 0xcc2660, 0xcc38e0, ...)
	/usr/local/src/go/src/reflect/value.go:371 +0x1167
reflect.Value.Call(0xd1fca0, 0xecb8c0, 0x13, 0xc420172660, 0x4, 0x4, 0xc42039fe68, 0xbf0c71, 0x40d9b2)
	/usr/local/src/go/src/reflect/value.go:302 +0xa4
s4s/vendor/github.com/gocelery/gocelery.runTaskFunc(0xc42039ff38, 0xc420172600, 0xd1fca0, 0xecb8c0, 0x13)
	/home/work/s4s_build/src/s4s/vendor/github.com/gocelery/gocelery/worker.go:158 +0x371
s4s/vendor/github.com/gocelery/gocelery.(*CeleryWorker).RunTask(0xc420063140, 0xc420172600, 0x0, 0x0, 0x401360)
	/home/work/s4s_build/src/s4s/vendor/github.com/gocelery/gocelery/worker.go:132 +0x217
s4s/vendor/github.com/gocelery/gocelery.(*CeleryWorker).StartWorker.func1(0xc420063140, 0x1)
	/home/work/s4s_build/src/s4s/vendor/github.com/gocelery/gocelery/worker.go:55 +0xb6
created by s4s/vendor/github.com/gocelery/gocelery.(*CeleryWorker).StartWorker
	/home/work/s4s_build/src/s4s/vendor/github.com/gocelery/gocelery/worker.go:38 +0x99

I saw the code here

// special case - convert float64 to int if applicable
// this is due to json limitation where all numbers are converted to float64
if origType == reflect.Int && msgType == reflect.Float64 {
	arg = int(arg.(float64))
}

I was wondering if int64 type is considered