Visitor Overload

[RxDave]

Consider defining an overload of the service operators (and secure variants) accepting an expression tree visitor rather than an IQbservableProvider. This could make pre-processing much easier for services since in many cases the only reason for creating their own providers, which can be failry complex, is to have access to a single visitor. Also consider an overload that takes a sequence of visitors and applies them to the client's expression in the order in which they're specified.

[RxDave]

To be released in the version following 2.0.4.

[RxDave]

Reopening because the visitor needs to be a factory so that the visitor object itself can be stateful. As of the current implementation, the supplied visitor referenced is shared by every subscriber.

[RxDave]

Fixed for the next release.