valid casts to anyarray

Hi list I've been down a rabbit hole today trying to understand what exactly makes a type a valid candidate for an ANYARRAY function argument (e.g., something you can 'unnest()'). My reading has led me across such functions as 'get_promoted_array_type', 'IsTrueArrayType', 'can_coerce_type', and '

Re: valid casts to anyarray

> Per the comments for check_generic_type_consistency: > > * 2) All arguments declared ANYARRAY must have the same datatype, > *which must be a varlena array type. > This must be exactly the bit that I missed during my reading - thanks! > It has to not only have an element type, but hav