update marshaling to use hex format, add github ci, update readme with explanation

.github/CODEOWNERS

@@ -0,0 +1,2 @@
+# For now, tag everyone who wants to participate
+* @deso-protocol/reviewers

.github/workflows/ci.yml

@@ -0,0 +1,60 @@
+name: ci
+
+on:
+  pull_request: {}
+  push:
+    branches:
+      - main
+
+jobs:
+#  go-fmt:
+#    name: go-fmt
+#    runs-on: ubuntu-20.04
+#
+#    steps:
+#      - name: Install Go
+#        uses: actions/setup-go@v2
+#        with:
+#          go-version: "1.20"
+#
+#      - name: Checkout branch
+#        uses: actions/checkout@v3
+#
+#      # Fail if go-fmt recommends any changes.
+#      - name: Run go fmt
+#        run: if [ "$(gofmt -s -l . | wc -l)" -gt 0 ]; then exit 1; fi
+
+  go-test:
+    name: go-test
+    runs-on: ubuntu-20.04
+
+    steps:
+      - name: Install Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: "1.20"
+
+      - name: Checkout branch
+        uses: actions/checkout@v3
+
+      - name: Cache dependencies
+        id: cache-dependencies
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.cache/go-build
+            ~/go/pkg/mod
+          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-go-
+
+      # Install dependencies if not found in cache.
+      - name: Install dependencies
+        if: steps.cache-dependencies.outputs.cache-hit != 'true'
+        run: go mod download && go install
+
+      - name: Build package
+        run: go build
+
+      - name: Run go test
+        run: go test -v ./

README.md

@@ -1,3 +1,10 @@
+# deso-protocol/Uint256
+This is a forked version of (https://github.com/holiman/uint256)[https://github.com/holiman/uint256]. 
+When deso-protocol go repositories began using this dependency, uint256 would marshal as a hex string.
+The source updated its code to better mirror the BigInt library to marshal as a decimal string.
+In order to maintain our APIs as they were but still take advantage of the latest updates, we have fork
+the repository and only made changes to revert to using a hex string for marshaling.
+
 # Fixed size 256-bit math library
 
 This is a library specialized at replacing the big.Int library for math based on 256-bit types, used by both 

conversion.go

@@ -692,7 +692,7 @@ func (z *Int) EncodeRLP(w io.Writer) error {
 // MarshalText implements encoding.TextMarshaler
 // MarshalText marshals using the decimal representation (compatible with big.Int)
 func (z *Int) MarshalText() ([]byte, error) {
-	return []byte(z.Dec()), nil
+	return []byte(z.Hex()), nil
 }
 
 // MarshalJSON implements json.Marshaler.
@@ -703,7 +703,7 @@ func (z *Int) MarshalText() ([]byte, error) {
 // integer space. Thus, U256 uses string-format, which is not compatible with
 // big.int (big.Int refuses to unmarshal a string representation).
 func (z *Int) MarshalJSON() ([]byte, error) {
-	return []byte(`"` + z.Dec() + `"`), nil
+	return []byte(`"` + z.Hex() + `"`), nil
 }
 
 // UnmarshalJSON implements json.Unmarshaler. UnmarshalJSON accepts either
@@ -719,7 +719,7 @@ func (z *Int) UnmarshalJSON(input []byte) error {
 
 // String returns the decimal encoding of b.
 func (z *Int) String() string {
-	return z.Dec()
+	return z.Hex()
 }
 
 const (

conversion_test.go

@@ -1278,19 +1278,19 @@ func TestEnDecode(t *testing.T) {
 		if have, want := intSample.Hex(), fmt.Sprintf("0x%s", bigSample.Text(16)); have != want {
 			t.Fatalf("test %d #1, have %v, want %v", i, have, want)
 		}
-		if have, want := intSample.String(), bigSample.String(); have != want {
+		if have, want := intSample.String(), wantHex; have != want {
 			t.Fatalf("test %d String(), have %v, want %v", i, have, want)
 		}
 		{
 			have, _ := intSample.MarshalText()
-			want, _ := bigSample.MarshalText()
+			want := []byte(wantHex)
 			if !bytes.Equal(have, want) {
 				t.Fatalf("test %d MarshalText, have %q, want %q", i, have, want)
 			}
 		}
 		{
 			have, _ := intSample.MarshalJSON()
-			want := []byte(fmt.Sprintf(`"%s"`, bigSample.Text(10)))
+			want := []byte(fmt.Sprintf(`"0x%s"`, bigSample.Text(16)))
 			if !bytes.Equal(have, want) {
 				t.Fatalf("test %d MarshalJSON, have %q, want %q", i, have, want)
 			}