Convert error slice to string slice

* feat: added test case for error slice to parse to string

* feat: added handler to convert an error slice to string slice

cast_test.go

@@ -6,6 +6,7 @@
 package cast
 
 import (
+	"errors"
 	"fmt"
 	"html/template"
 	"testing"
@@ -1057,6 +1058,7 @@ func TestToStringSliceE(t *testing.T) {
 		{[]string{"a", "b"}, []string{"a", "b"}, false},
 		{[]interface{}{1, 3}, []string{"1", "3"}, false},
 		{interface{}(1), []string{"1"}, false},
+		{[]error{errors.New("a"), errors.New("b")}, []string{"a", "b"}, false},
 		// errors
 		{nil, nil, true},
 		{testing.T{}, nil, true},

caste.go

@@ -1161,6 +1161,11 @@ func ToStringSliceE(i interface{}) ([]string, error) {
 		return a, nil
 	case string:
 		return strings.Fields(v), nil
+	case []error:
+		for _, err := range i.([]error) {
+			a = append(a, err.Error())
+		}
+		return a, nil
 	case interface{}:
 		str, err := ToStringE(v)
 		if err != nil {