Can't validate both `keys` and the struct value of maps of structs

[bfabio]

• [x] I have looked at the documentation here first?
• [x] I have looked at the examples provided that may showcase my question here?

Package version eg. v9, v10:

v10

Issue, Question or Enhancement:

When you have a map with struct values, it looks there is no way to validate both the keys and the struct, you can only validate the keys OR the struct.

Code sample, to showcase or reproduce:

This works as expected, returning a validation error because Name is required in Author.

package main

import (
    "fmt"

    "github.com/go-playground/validator/v10"
)

type Book struct {
    RelatedAuthors map[string]Author `validate:"dive"`
}

type Author struct {
    Name string `validate:"required"`
}

func main() {
    validate := validator.New(validator.WithRequiredStructEnabled())

    book := Book{
        RelatedAuthors: map[string]Author{
            "12345": {},
        },
    }

    err := validate.Struct(book)
    if err != nil {
        fmt.Println("Validation error:", err)
    } else {
        fmt.Println("Validation successful")
    }
}

Validation error: Key: 'Book.RelatedAuthors[12345].Name' Error:Field validation for 'Name' failed on the 'required' tag

This validates successfully, even if Name is required

package main

import (
    "fmt"

    "github.com/go-playground/validator/v10"
)

type Book struct {
    RelatedAuthors map[string]Author `validate:"dive,keys,len=5,endkeys"`
}

type Author struct {
    Name string `validate:"required"`
}

func main() {
    validate := validator.New(validator.WithRequiredStructEnabled())

    book := Book{
        RelatedAuthors: map[string]Author{
            "12345": {},
        },
    }

    err := validate.Struct(book)
    if err != nil {
        fmt.Println("Validation error:", err)
    } else {
        fmt.Println("Validation successful")
    }
}

Validation successful

The only difference between the two testcases is:

        RelatedAuthors map[string]Author `validate:"dive"`
        // vs
    RelatedAuthors map[string]Author `validate:"dive,keys,len=5,endkeys"`