Use Default Interface Methods

[tb-mtg]

Just as suggestion, have you considered moving repeated implementation logic code into their interfaces by taking advantage of default interface methods?

For example, the following overrides could be removed from:
https://github.com/RCommon-Team/RCommon/blob/main/Src/RCommon.Linq2Db/Crud/Linq2DbRepository.cs

public override IQueryable<TEntity> FindQuery(ISpecification<TEntity> specification)  
{
  ... // Logic moved into ILinqRepository.cs
}

public async override Task<IPaginatedList<TEntity>> FindAsync(IPagedSpecification<TEntity> specification, CancellationToken token = default)
{
  ... // Logic moved into ILinqRepository.cs
}

and moved into:
https://github.com/RCommon-Team/RCommon/blob/main/Src/RCommon.Persistence/Crud/ILinqRepository.cs

public interface ILinqRepository<TEntity> : IQueryable<TEntity>, IReadOnlyRepository<TEntity>, IWriteOnlyRepository<TEntity>, 
  IEagerLoadableQueryable<TEntity> 
  where TEntity : IBusinessEntity 
{
  ...
  IQueryable<TEntity> FindQuery(ISpecification<TEntity> specification) 
    => FindQuery(specification.Predicate);


  Task<IPaginatedList<TEntity>> FindAsync(IPagedSpecification<TEntity> specification, CancellationToken token = default) 
    => FindAsync(specification.Predicate, specification.OrderByExpression, specification.OrderByAscending, specification.PageIndex, specification.PageSize, token);

  ...
}

[JasonMWebb]

That is a nice language feature. I'm pretty close to finishing the hardening of version 2.0 and then am quickly moving on to version 2.0.1 where we'll need to begin changing the interfaces in this area. It may be a nice time to look at cleaning up the code a bit with something like default interface methods. Nice recommendation!