tpl/partials: Allow any key type in partialCached

Fixes #6572

helpers/general.go

@@ -23,11 +23,14 @@ import (
 	"os"
 	"path/filepath"
 	"sort"
+	"strconv"
 	"strings"
 	"sync"
 	"unicode"
 	"unicode/utf8"
 
+	"github.com/mitchellh/hashstructure"
+
 	"github.com/gohugoio/hugo/hugofs"
 
 	"github.com/gohugoio/hugo/common/hugo"
@@ -482,3 +485,20 @@ func PrintFs(fs afero.Fs, path string, w io.Writer) {
 		return nil
 	})
 }
+
+// HashString returns a hash from the given elements.
+// It will panic if the hash cannot be calculated.
+func HashString(elements ...interface{}) string {
+	var o interface{}
+	if len(elements) == 1 {
+		o = elements[0]
+	} else {
+		o = elements
+	}
+
+	hash, err := hashstructure.Hash(o, nil)
+	if err != nil {
+		panic(err)
+	}
+	return strconv.FormatUint(hash, 10)
+}