This post refers to the handling of array configuration items as they exist in ASP.Net core Configuration since 1.0 up to now (RT 2.0.5, SDK 2.1.4). Example on how ASP.Net Core handles overwriting loaded array configuration when the later read config files contain less array entries than before. Arrays are not complete replaced but only the first n entries that are actully given in the later config files are being replaced, leaving