YAML arrays can not be mapped to []string

[newink]

YAML:

WriteRoles: 
  - Writer
ReadRoles:
  - Writer
  - Reader
ListRoles:
  - Writer
  - Reader

Struct:

type TestConfig struct {
	ReadRoles  []Role `yaml:"ReadRoles"`
	WriteRoles []Role `yaml:"WriteRoles"`
	ListRoles  []Role `yaml:"ListRoles"`
}
type Role string

Error:

    suite.go:63: test panicked: string Writer
        goroutine 26 [running]:
        runtime/debug.Stack()
        	/usr/local/opt/go/libexec/src/runtime/debug/stack.go:24 +0x7a
        github.com/stretchr/testify/suite.failOnPanic(0xc000545040)
        	/Users/sivanov/go/pkg/mod/github.com/stretchr/[email protected]/suite/suite.go:63 +0x54
        panic({0x255a9c0, 0xc000088130})
        	/usr/local/opt/go/libexec/src/runtime/panic.go:844 +0x25a
        github.com/cristalhq/aconfig.mii({0x255a9c0, 0xc000191a50})
        	/Users/sivanov/go/pkg/mod/github.com/cristalhq/[email protected]/reflection.go:389 +0x36e

seems that array is just unexpected here: