Non-obvious behavior in client.HandleCmd

[sl4mmer]

How to reproduce
Using JSClient provide user or timestamp as integers
What Happens
Providing user or timestamp as integers causes following errors in client.HandleCmd respectively

json: cannot unmarshal number into Go value of type libcentrifugo.UserID
json: cannot unmarshal number into Go value of type string

Solution
Probably implict type cast in Js Client (and other lang-libraries) is the best solution...

[FZambia]

Hello! User ID can be a non number, for example MongoDB object id, so explicitly providing string as it happens now seems to be a right way.

I also don't think that we need to typecast timestamp because lots of libraries in languages return timestamp with microseconds while we need only seconds. The result of type cast can be even more non obvious. I think providing utility functions like the one from centrifuge-go is a better way.

[sl4mmer]

Then maybe let's just add a notice to JsClient documentation ?

[FZambia]

Yep, commited