Ignore readonly properties

[llupa]

I am opening this PR as a starting point and to address #174

[mnapoli]

What will this code do? It seems like readonly properties would be empty. Shouldn't it contain the value of the original object? (else it's not really cloning)

[llupa]

Yes the same value is in both origin and clone objects. The assertion function in this package checks both arguments have equal values but they are not the same object.

I did try it with simple use cases, I can add more tests as a next step.

[mnapoli]

Oh ok awesome thanks! Let's run the CI!

[llupa]

I saw the CI failing for all version below 8.1, I think I misunderstood how @requires works. Will update this in the upcoming days!

Edit: @mnapoli I added test fixtures in their new dedicated namespace. I have 2 classes, 1 with 3 sample scalar readonly properties and another one with readonly object property typed from the former class.

I did try this in a test branch and I know it passes. If you think that the assertion does not let this be very transparent, I can also just compare the property values one by one. As you wish

[mnapoli]

It's green 🙌