Support C# parameters with default values followed by ParamArray

[cmeeren]

I propose we support C# parameters with default values, like the below (from FluentAssertions):

public AndConstraint<TAssertions> BeNull(string because = "", params object[] becauseArgs)

In C#, this can be called as BeNull(). However, in F#, we have to supply the because parameter and therefore have to write BeNull("").

Pros and Cons

The advantages of making this adjustment to F# are: Working as expected, same as existing optional parameters.

The disadvantages of making this adjustment to F# are: None.

Extra information

Estimated cost (XS, S, M, L, XL, XXL): S

Related suggestions: (put links to related suggestions here)

Affidavit (please submit!)

Please tick this by placing a cross in the box:

• [x] This is not a question (e.g. like one you might ask on stackoverflow) and I have searched stackoverflow for discussions of this issue
• [x] I have searched both open and closed suggestions on this site and believe this is not a duplicate
• [x] This is not something which has obviously "already been decided" in previous versions of F#. If you're questioning a fundamental design decision that has obviously already been taken (e.g. "Make F# untyped") then please don't submit it.

Please tick all that apply:

• [x] This is not a breaking change to the F# language design
• [ ] I or my company would be willing to help implement and/or test this

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[vzarytovskii]

The disadvantages of making this adjustment to F# are: None.

Disadvantage is probably that we're risking to break current method resolution corner cases.

[vzarytovskii]

By the way, it's only a problem, when there is ParamArray in signature