Is it binary-compatible to delete (required) attribute?

[oosavu]

Hi!
Is it breaks binary compatibility to delete 'required' attribute from field?
For example let's assume that initially we had version_1:

table ChildTable
{   
    foo: string;
    bar: int; 
}

table ParentTable
{   
    baz: float;
    child: ChildTable (required); 
}

And then we changed ParentTable (version_2):

table ParentTable
{   
    baz: float;
    child: ChildTable; 
}

Also let's assume that we send ParentTable from server to client.
Initially we had version 1 in both client and server. At some point we changed protocol to v2 version on server side. Will we get an error on client side?