MONGOID-5816: attr_readonly leaks into sibling classes (backport for 8.1) #5920
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MONGOID-5816
When we have two classes A and B that are subclasses from Base, declaring attr_readonly in the context of A or B leaks that declaration into the entire class hierarchy. Currently, all classses share the same readonly attributes at the end of declaration. Fixed so that A and B inherit the read only attributes of Base but including additional readonly attributes in the subclasses is instance specific.