Empty arrays of struct type error as invalid value

When an array of type struct is defined for a schema and an empty array is specified, the empty array is reported as the wrong type. This is not the case for a basic type.

# incorrect w/ struct
Class.new(Dry::Validation::Contract) { params { required(:list).array(Dry.Struct(name: 'string')) } }.new.call(list: [])
=> #<Dry::Validation::Result{:list=>{}} errors={:list=>["must be an array"]}>

# correct w/o struct
Class.new(Dry::Validation::Contract) { params { required(:list).array(:string) } }.new.call(list: [])
=> #<Dry::Validation::Result{:list=>[]} errors={}>

I'm not quite sure why dry-schema thinks it's not an array being passed in.

• dry-schema 1.5.5
• dry-validation 1.5.6
• dry-struct 1.3.0
• dry-types 1.4.0

Start by reproducing the struct-array example from the issue and compare it with the basic-type array example. Trace the schema entry point created by required(:list).array(Dry.Struct(...)) to find why [] is reported as invalid, then verify that an empty struct array succeeds without errors while invalid element values remain rejected.