$PSBoundParametersDictionary should better inherit from System.Collections.Hashtable

Summary of the new feature / enhancement

Currently the System.Management.Automation.PSBoundParametersDictionary class inherits from System.Collections.Generic.Dictionary<string, object>. This leads to following problems:

Whenever you add or remove elements to or from the automatic variable PSBoundParameters, a bool value is output. This is because the Add and Remove methods of the class Dictionary are not void.

That is for C# not a problem, but in Powershell, a script or function using those methods produces unwanted output.

I propose to inherit from the System.Collections.Hashtable class. This is actually also what a pwsh developer would expect.

I also recommend to define a specialized object for the Value object of each parameter element. This specialized object, let's call it PSBoundArgument should have two read-only properties:

IsBoundPositionally
IsBoundByDefaultValue

This approach is much more reasonable than the current solution of having a List of positional values as the BoundPositionally property of the dictionary!

That, of course, would complicate the assignment of new items to $PSBoundParameters, so the Add method has then to be overridden, so that objects of correct types are added to the hashtable. Maybe a third property called IsAdditional is then reqired too.

Proposed technical implementation details (optional)

No response

No file or test is named. Start by locating the System.Management.Automation.PSBoundParametersDictionary class and reviewing its current inheritance, Add/Remove behavior, and BoundPositionally representation; done would require settling and implementing the proposed API changes with suitable regression coverage.