.NET arrays bind to params arrays

[slozier]

For example:

assert list(map(str.upper, System.Array[str](("a", "b")))) == ['A', 'B']

fails with:

TypeError: upper() takes no arguments (2 given)

The method signature is:

public Map(CodeContext context, object? func, [NotNull]params object[] iterables);

This used to work with IronPython 2 because the method signature for map was different:

public static List map(CodeContext/*!*/ context, params object[] param);

[BCSharp]

IronLanguages/dlr#249 addresses this issue at the DLR level.