isDate not defined

[ScottTrenda]

In the backported param serializer, isDate and toJson are used in serializeValue, but they are not defined anywhere in the code. Either add these params to avoid errors in this provider, or remove the provider entirely.

Also, since Emrah came across this bug when using expectMany incorrectly, it may be a good idea to do a more in-depth param sniff at the beginning of those functions, and throw an error if any are provided incorrectly.