[Issue|Question] Regarding `map[string][]string`

[eltonsv]

Hi folks, we noticed that for configs with JSON pointing to map[string][]string, it fails with the error, and we are unable to parse these JSONs. Could you please help us if there is something wrong with the implementation? Added a test that replicates this below:

package app

import (
	"encoding/json"
	"testing"

	"github.com/caarlos0/env/v10"
	"github.com/stretchr/testify/assert"
)

type AppConfigTest struct {
	FinanceAllowedRoles FinanceRolesMapTest `env:"FINANCE_ALLOWED_ROLES"`
}

type FinanceRolesMapTest map[string][]string

func (rc *FinanceRolesMapTest) UnmarshalText(b []byte) error {
	return json.Unmarshal(b, &rc)
}

func TestParseConfig(t *testing.T) {
	t.Setenv("FINANCE_ALLOWED_ROLES", `{"DEFAULT":["ADMIN"]}`)
	_, err := parseConfigTest()
	assert.Equal(t, nil, err)
}

func parseConfigTest() (AppConfigTest, error) {
	var config AppConfigTest

	if err := env.Parse(&config); err != nil {
		return AppConfigTest{}, err
	}

	return config, nil
}

yields

=== RUN   TestParseConfig
    config_test.go:24: 
        	Error Trace:	/Users/e.savio/go/dh/dh-vt-kratos/go-services/vp-finance-backend/app/config_test.go:24
        	Error:      	Not equal: 
        	            	expected: <nil>(<nil>)
        	            	actual  : env.AggregateError(env.AggregateError{Errors:[]error{env.ParseError{Name:"FinanceAllowedRoles", Type:(*reflect.rtype)(0x1c3ce80), Err:(*json.UnmarshalTypeError)(0xc000196820)}}})
        	Test:       	TestParseConfig
--- FAIL: TestParseConfig (0.00s)

Expected :<nil>(<nil>)
Actual   :env.AggregateError(env.AggregateError{Errors:[]error{env.ParseError{Name:"FinanceAllowedRoles", Type:(*reflect.rtype)(0x1c3ce80), Err:(*json.UnmarshalTypeError)(0xc000196820)}}})
FAIL

Process finished with the exit code 1

Do you know if there is something that needs to be changed to support this in the json/implementation, or if this is an issue in the parsing?

Thank you so much