identity: Upgrade to github.com/mitchellh/hashstructure/v2 v2.0.2

```
name                 old time/op    new time/op    delta
HashString/n28-10       131ns ± 7%     133ns ±19%   ~     (p=0.343 n=4+4)
HashString/n112-10      237ns ± 5%     241ns ± 3%   ~     (p=0.229 n=4+4)
HashString/n448-10      688ns ± 3%     687ns ± 1%   ~     (p=0.886 n=4+4)
HashString/n1792-10    2.51µs ± 3%    2.56µs ± 3%   ~     (p=0.200 n=4+4)
HashString/n7168-10    10.1µs ± 2%    10.0µs ± 4%   ~     (p=0.686 n=4+4)

name                 old alloc/op   new alloc/op   delta
HashString/n28-10       80.0B ± 0%     80.0B ± 0%   ~     (all equal)
HashString/n112-10       160B ± 0%      160B ± 0%   ~     (all equal)
HashString/n448-10       496B ± 0%      496B ± 0%   ~     (all equal)
HashString/n1792-10    1.84kB ± 0%    1.84kB ± 0%   ~     (all equal)
HashString/n7168-10    8.24kB ± 0%    8.24kB ± 0%   ~     (all equal)

name                 old allocs/op  new allocs/op  delta
HashString/n28-10        4.00 ± 0%      4.00 ± 0%   ~     (all equal)
HashString/n112-10       4.00 ± 0%      4.00 ± 0%   ~     (all equal)
HashString/n448-10       4.00 ± 0%      4.00 ± 0%   ~     (all equal)
HashString/n1792-10      4.00 ± 0%      4.00 ± 0%   ~     (all equal)
HashString/n7168-10      4.00 ± 0%      4.00 ± 0%   ~     (all equal)
```

Closes #11644

config/namespace_test.go

@@ -43,7 +43,7 @@ func TestNamespace(t *testing.T) {
 	c.Assert(err, qt.IsNil)
 	c.Assert(ns, qt.Not(qt.IsNil))
 	c.Assert(ns.SourceStructure, qt.DeepEquals, map[string]interface{}{"foo": "bar"})
-	c.Assert(ns.SourceHash, qt.Equals, "14368731254619220105")
+	c.Assert(ns.SourceHash, qt.Equals, "5334326627423288605")
 	c.Assert(ns.Config, qt.DeepEquals, &tstNsExt{Foo: "bar"})
 	c.Assert(ns.Signature(), qt.DeepEquals, []*tstNsExt(nil))
 }

go.mod

@@ -53,7 +53,7 @@ require (
 	github.com/makeworld-the-better-one/dither/v2 v2.4.0
 	github.com/marekm4/color-extractor v1.2.1
 	github.com/mattn/go-isatty v0.0.20
-	github.com/mitchellh/hashstructure v1.1.0
+	github.com/mitchellh/hashstructure/v2 v2.0.2
 	github.com/mitchellh/mapstructure v1.5.1-0.20231216201459-8508981c8b6c
 	github.com/muesli/smartcrop v0.3.0
 	github.com/niklasfasching/go-org v1.7.0

go.sum

@@ -377,8 +377,8 @@ github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWE
 github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
 github.com/mattn/go-runewidth v0.0.9 h1:Lm995f3rfxdpd6TSmuVCHVb/QhupuXlYr8sCI/QdE+0=
 github.com/mattn/go-runewidth v0.0.9/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
-github.com/mitchellh/hashstructure v1.1.0 h1:P6P1hdjqAAknpY/M1CGipelZgp+4y9ja9kmUZPXP+H0=
-github.com/mitchellh/hashstructure v1.1.0/go.mod h1:xUDAozZz0Wmdiufv0uyhnHkUTN6/6d8ulp4AwfLKrmA=
+github.com/mitchellh/hashstructure/v2 v2.0.2 h1:vGKWl0YJqUNxE8d+h8f6NJLcCJrgbhC4NcD46KavDd4=
+github.com/mitchellh/hashstructure/v2 v2.0.2/go.mod h1:MG3aRVU/N29oo/V/IhBX8GR/zz4kQkprJgF2EVszyDE=
 github.com/mitchellh/mapstructure v1.5.1-0.20231216201459-8508981c8b6c h1:cqn374mizHuIWj+OSJCajGr/phAmuMug9qIX3l9CflE=
 github.com/mitchellh/mapstructure v1.5.1-0.20231216201459-8508981c8b6c/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo=
 github.com/mohae/deepcopy v0.0.0-20170929034955-c48cc78d4826 h1:RWengNIwukTxcDr9M+97sNutRR1RKhG96O6jWumTTnw=

identity/identityhash.go

@@ -16,7 +16,7 @@ package identity
 import (
 	"strconv"
 
-	"github.com/mitchellh/hashstructure"
+	"github.com/mitchellh/hashstructure/v2"
 )
 
 // HashString returns a hash from the given elements.
@@ -44,7 +44,7 @@ func HashUint64(vs ...any) uint64 {
 		o = elements
 	}
 
-	hash, err := hashstructure.Hash(o, nil)
+	hash, err := hashstructure.Hash(o, hashstructure.FormatV2, nil)
 	if err != nil {
 		panic(err)
 	}

resources/internal/key_test.go

@@ -32,5 +32,5 @@ func TestResourceTransformationKey(t *testing.T) {
 	key := NewResourceTransformationKey("testing",
 		testStruct{Name: "test", V1: int64(10), V2: int32(20), V3: 30, V4: uint64(40)})
 	c := qt.New(t)
-	c.Assert(key.Value(), qt.Equals, "testing_518996646957295636")
+	c.Assert(key.Value(), qt.Equals, "testing_5850874845946291698")
 }

resources/resource_factories/create/remote_test.go

@@ -121,15 +121,16 @@ func TestRemoteResourceKeys(t *testing.T) {
 	c := qt.New(t)
 
 	check := func(uri string, optionsm map[string]any, expect1, expect2 string) {
+		c.Helper()
 		got1, got2 := remoteResourceKeys(uri, optionsm)
 		c.Assert(got1, qt.Equals, expect1)
 		c.Assert(got2, qt.Equals, expect2)
 	}
 
-	check("foo", nil, "5917621528921068675", "5917621528921068675")
-	check("foo", map[string]any{"bar": "baz"}, "7294498335241413323", "7294498335241413323")
-	check("foo", map[string]any{"key": "1234", "bar": "baz"}, "14904296279238663669", "7294498335241413323")
-	check("foo", map[string]any{"key": "12345", "bar": "baz"}, "12191037851845371770", "7294498335241413323")
-	check("asdf", map[string]any{"key": "1234", "bar": "asdf"}, "14904296279238663669", "3787889110563790121")
-	check("asdf", map[string]any{"key": "12345", "bar": "asdf"}, "12191037851845371770", "3787889110563790121")
+	check("foo", nil, "10276615683545312752", "10276615683545312752")
+	check("foo", map[string]any{"bar": "baz"}, "9898282343037894676", "9898282343037894676")
+	check("foo", map[string]any{"key": "1234", "bar": "baz"}, "14904296279238663669", "9898282343037894676")
+	check("foo", map[string]any{"key": "12345", "bar": "baz"}, "12191037851845371770", "9898282343037894676")
+	check("asdf", map[string]any{"key": "1234", "bar": "asdf"}, "14904296279238663669", "3005610248808565917")
+	check("asdf", map[string]any{"key": "12345", "bar": "asdf"}, "12191037851845371770", "3005610248808565917")
 }

resources/resource_transformers/js/options_test.go

@@ -44,7 +44,7 @@ func TestOptionKey(t *testing.T) {
 
 	key := (&buildTransformation{optsm: opts}).Key()
 
-	c.Assert(key.Value(), qt.Equals, "jsbuild_7891849149754191852")
+	c.Assert(key.Value(), qt.Equals, "jsbuild_9458638411414195026")
 }
 
 func TestToBuildOptions(t *testing.T) {

resources/resources_integration_test.go

@@ -159,9 +159,9 @@ resize 2|RelPermalink: {{ $image.RelPermalink }}|MediaType: {{ $image.MediaType
 	b := hugolib.Test(t, files)
 
 	b.AssertFileContent("public/index.html",
-		"jpg|RelPermalink: /images/pixel_hu8aa3346827e49d756ff4e630147c42b5_70_filter_17010532266664966692.jpg|MediaType: image/jpeg|Width: 1|Height: 1|",
-		"resize 1|RelPermalink: /images/pixel_hu8aa3346827e49d756ff4e630147c42b5_70_filter_6707036659822075562.jpg|MediaType: image/jpeg|Width: 20|Height: 30|",
-		"resize 2|RelPermalink: /images/pixel_hu8aa3346827e49d756ff4e630147c42b5_70_filter_6707036659822075562.jpg|MediaType: image/jpeg|Width: 20|Height: 30|",
+		"jpg|RelPermalink: /images/pixel_hu8aa3346827e49d756ff4e630147c42b5_70_filter_14347832029652749901.jpg|MediaType: image/jpeg|Width: 1|Height: 1|",
+		"resize 1|RelPermalink: /images/pixel_hu8aa3346827e49d756ff4e630147c42b5_70_filter_14038289290831899195.jpg|MediaType: image/jpeg|Width: 20|Height: 30|",
+		"resize 2|RelPermalink: /images/pixel_hu8aa3346827e49d756ff4e630147c42b5_70_filter_14038289290831899195.jpg|MediaType: image/jpeg|Width: 20|Height: 30|",
 	)
 }
 

tpl/collections/reflect_helpers.go

@@ -19,7 +19,7 @@ import (
 	"reflect"
 
 	"github.com/gohugoio/hugo/common/types"
-	"github.com/mitchellh/hashstructure"
+	"github.com/gohugoio/hugo/identity"
 )
 
 var (
@@ -47,14 +47,9 @@ func numberToFloat(v reflect.Value) (float64, error) {
 // to make them comparable
 func normalize(v reflect.Value) any {
 	k := v.Kind()
-
 	switch {
 	case !v.Type().Comparable():
-		h, err := hashstructure.Hash(v.Interface(), nil)
-		if err != nil {
-			panic(err)
-		}
-		return h
+		return identity.HashUint64(v.Interface())
 	case isNumber(k):
 		f, err := numberToFloat(v)
 		if err == nil {