There are two main problems with having a component of a record be an array.

1. By default, the generated equals and hashCode will just call equals or hashCode on the array. Two distinct arrays are never considered equal by equals even if their contents are the same. The generated toString is similarly not useful, since it will be something like [B@723279cf.

2. Arrays are mutable, but records should not be mutable. A client of a record with an array component can change the contents of the array.

Instead of an array component, consider something like ImmutableList<String>, or, for primitive arrays, something like ByteString or ImmutableIntArray.