Support encoding json.Number type (#923)

Co-authored-by: Thomas Pelletier <thomas@pelletier.codes>

cmd/jsontoml/main_test.go

@@ -11,10 +11,11 @@ import (
 
 func TestConvert(t *testing.T) {
 	examples := []struct {
-		name     string
-		input    string
-		expected string
-		errors   bool
+		name          string
+		input         string
+		expected      string
+		errors        bool
+		useJsonNumber bool
 	}{
 		{
 			name: "valid json",
@@ -26,6 +27,19 @@ func TestConvert(t *testing.T) {
 }`,
 			expected: `[mytoml]
 a = 42.0
+`,
+		},
+		{
+			name:          "use json number",
+			useJsonNumber: true,
+			input: `
+{
+  "mytoml": {
+    "a": 42
+  }
+}`,
+			expected: `[mytoml]
+a = 42
 `,
 		},
 		{
@@ -37,6 +51,7 @@ a = 42.0
 
 	for _, e := range examples {
 		b := new(bytes.Buffer)
+		useJsonNumber = e.useJsonNumber
 		err := convert(strings.NewReader(e.input), b)
 		if e.errors {
 			require.Error(t, err)