super quick performance win in the case where people don't pass in distinct values

src/Umbraco.Core/Persistence/Repositories/RepositoryBase.cs

@@ -133,6 +133,9 @@ namespace Umbraco.Core.Persistence.Repositories
         /// <returns></returns>
         public IEnumerable<TEntity> GetAll(params TId[] ids)
         {
+            //ensure they are de-duplicated, easy win if people don't do this as this can cause many excess queries
+            ids = ids.Distinct().ToArray();
+
             if (ids.Any())
             {
                 var entities = _cache.GetByIds(

src/Umbraco.Core/Persistence/Repositories/ScriptRepository.cs

@@ -64,6 +64,9 @@ namespace Umbraco.Core.Persistence.Repositories
 
         public override IEnumerable<Script> GetAll(params string[] ids)
         {
+            //ensure they are de-duplicated, easy win if people don't do this as this can cause many excess queries
+            ids = ids.Distinct().ToArray();
+
             if (ids.Any())
             {
                 foreach (var id in ids)

src/Umbraco.Core/Persistence/Repositories/StylesheetRepository.cs

@@ -106,6 +106,9 @@ namespace Umbraco.Core.Persistence.Repositories
 
         public override IEnumerable<Stylesheet> GetAll(params string[] ids)
         {
+            //ensure they are de-duplicated, easy win if people don't do this as this can cause many excess queries
+            ids = ids.Distinct().ToArray();
+
             if (ids.Any())
             {
                 foreach (var id in ids)