diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
new file mode 100644
index 0000000..7f26a2c
--- /dev/null
+++ b/.github/workflows/tests.yml
@@ -0,0 +1,40 @@
+name: Go Tests
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+concurrency:
+  group: ci-${{ github.ref }}-test
+  cancel-in-progress: true
+
+jobs:
+  test:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest]
+        golang: ['1.13.15', '1.25.5']
+
+    runs-on: ${{ matrix.os }}
+    env:
+      DBGSYNCLOG: trace
+      DBGSYNCON: true
+
+    steps:
+      - name: Check out code into the Go module directory
+        uses: actions/checkout@v5
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
+          fetch-depth: 0
+
+      - name: Set up Go ${{ matrix.golang }}
+        uses: actions/setup-go@v6
+        with:
+          go-version: ${{ matrix.golang }}
+          check-latest: false
+
+      - name: Run tests
+        run: |
+          make test
diff --git a/.gitignore b/.gitignore
index d45bb56..4b514c5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,3 @@
-*~
 protobuf-fuzz.zip
-workdir
\ No newline at end of file
+workdir
+.idea/**
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..8a20a91
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,18 @@
+tidy:
+	go mod tidy
+
+# Coding style static check.
+lint: tidy
+	# keep this in sync with .github/workflows/golangci-lint.yml
+	go install github.com/golangci/golangci-lint/v2/cmd/golangci-lint@v2.6.1
+	go mod tidy
+	golangci-lint run
+
+test: tidy
+	export GOARCH='amd64' && go test ./...
+	export GOARCH='386' && go test ./...
+
+# target to run all the possible checks; it's a good habit to run it before
+# pushing code
+check: lint test
+	echo "check done"
diff --git a/array_test.go b/array_test.go
index d57c62f..9d69115 100644
--- a/array_test.go
+++ b/array_test.go
@@ -2,6 +2,7 @@ package protobuf
 
 import (
 	"encoding/hex"
+	"math"
 	"reflect"
 	"testing"
 
@@ -26,7 +27,7 @@ type ArrayTest3 struct {
 
 func TestArray(t *testing.T) {
 	// largest int32 is 2147483647
-	var large int = 3147483647
+	var large int = math.MaxInt32 - 1
 
 	a0 := ArrayTest0{[]int{1, 1, large}}
 	a1 := ArrayTest1{[]int64{1, 1, 1}}
diff --git a/encoding_test.go b/encoding_test.go
index a65b2e4..4dcf1c0 100644
--- a/encoding_test.go
+++ b/encoding_test.go
@@ -227,7 +227,7 @@ func TestArrayKey(t *testing.T) {
 	assert.False(t, t1.M[k3])
 }
 
-func TestInterface(t *testing.T) {
+func TestPointInterface(t *testing.T) {
 	type Points struct {
 		P1 kyber.Point
 		P2 kyber.Point
@@ -254,6 +254,35 @@ func TestInterface(t *testing.T) {
 	require.Equal(t, pp.P2.String(), dpp.P2.String())
 }
 
+func TestScalarInterface(t *testing.T) {
+	ed25519 := suites.MustFind("ed25519")
+
+	RegisterInterface(func() interface{} { return ed25519.Scalar() })
+	//	RegisterInterface(func() interface{} { return ed25519.ScalarLen() })
+
+	type BasicSig struct {
+		C kyber.Scalar
+		R kyber.Scalar
+	}
+
+	pseudoRand := ed25519.XOF([]byte("test scalar interface"))
+
+	sig := BasicSig{
+		C: ed25519.Scalar().Pick(pseudoRand),
+		R: ed25519.Scalar().Pick(pseudoRand),
+	}
+
+	buf, err := Encode(&sig)
+	require.NoError(t, err)
+
+	var dsig BasicSig
+	err = Decode(buf, &dsig)
+	require.NoError(t, err)
+
+	require.Equal(t, sig.C.String(), dsig.C.String())
+	require.Equal(t, sig.R.String(), dsig.R.String())
+}
+
 type dummyInterface interface {
 	String() string
 	encoding.BinaryUnmarshaler
diff --git a/go.sum b/go.sum
index ccb5242..d283601 100644
--- a/go.sum
+++ b/go.sum
@@ -7,7 +7,6 @@ github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 go.dedis.ch/fixbuf v1.0.3 h1:hGcV9Cd/znUxlusJ64eAlExS+5cJDIyTyEG+otu5wQs=
 go.dedis.ch/fixbuf v1.0.3/go.mod h1:yzJMt34Wa5xD37V5RTdmp38cz3QhMagdGoem9anUalw=
-go.dedis.ch/kyber/v3 v3.0.4 h1:FDuC/S3STkvwxZ0ooo3gcp56QkUKsN7Jy7cpzBxL+vQ=
 go.dedis.ch/kyber/v3 v3.0.4/go.mod h1:OzvaEnPvKlyrWyp3kGXlFdp7ap1VC6RkZDTaPikqhsQ=
 go.dedis.ch/kyber/v3 v3.0.9 h1:i0ZbOQocHUjfFasBiUql5zVeC7u/vahFd96DFA8UOWk=
 go.dedis.ch/kyber/v3 v3.0.9/go.mod h1:rhNjUUg6ahf8HEg5HUvVBYoWY4boAafX8tYxX+PS+qg=