How to express arguments?

[grokys]

We're currently passing arguments using standard C# parameters, but this has a couple of problems:

1. Since #166, the arguments are now sorted by name. This means if an argument is added to the schema, it could show up in the middle of existing arguments breaking our API.
2. In theory we can use named arguments (which would also solve 1) but in reality we often can't because C# expressions don't support named arguments, leading to some horrible null, null, null, null business. And because of this, adding an argument to the schema is a breaking change.

@StanleyGoldman suggested doing something like this instead:

Repository(x => x.Owner("Owner").Name("Name"))

Pros:

1. Additions to schema no longer break our API
2. Will no longer see null, null, null, null in expressions

Cons:

1. Will need to generate a lot more code
2. Moves us further away from looking like "just C#" code

I was originally against this idea because of the cons above, but I'm starting to think the pros outweigh the cons, especially given that it looks like C#'s expression support isn't going to be improved anytime soon (despite some proposals).

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