accounts/abi: Add the original name as json-structtag for tuples.

accounts/abi/type.go

@@ -188,6 +188,7 @@ func NewType(t string, components []ArgumentMarshaling) (typ Type, err error) {
 			fields = append(fields, reflect.StructField{
 				Name: ToCamelCase(c.Name), // reflect.StructOf will panic for any exported field.
 				Type: cType.Type,
+				Tag:  reflect.StructTag("json:\"" + c.Name + "\""),
 			})
 			elems = append(elems, &cType)
 			names = append(names, c.Name)

accounts/abi/type_test.go

@@ -95,8 +95,14 @@ func TestTypeRegexp(t *testing.T) {
 		// {"fixed[2]", nil, Type{}},
 		// {"fixed128x128[]", nil, Type{}},
 		// {"fixed128x128[2]", nil, Type{}},
-		{"tuple", []ArgumentMarshaling{{Name: "a", Type: "int64"}}, Type{Kind: reflect.Struct, T: TupleTy, Type: reflect.TypeOf(struct{ A int64 }{}), stringKind: "(int64)",
+		{"tuple", []ArgumentMarshaling{{Name: "a", Type: "int64"}}, Type{Kind: reflect.Struct, T: TupleTy, Type: reflect.TypeOf(struct {
+			A int64 `json:"a"`
+		}{}), stringKind: "(int64)",
 			TupleElems: []*Type{{Kind: reflect.Int64, T: IntTy, Type: reflect.TypeOf(int64(0)), Size: 64, stringKind: "int64"}}, TupleRawNames: []string{"a"}}},
+		{"tuple with long name", []ArgumentMarshaling{{Name: "aTypicalParamName", Type: "int64"}}, Type{Kind: reflect.Struct, T: TupleTy, Type: reflect.TypeOf(struct {
+			ATypicalParamName int64 `json:"aTypicalParamName"`
+		}{}), stringKind: "(int64)",
+			TupleElems: []*Type{{Kind: reflect.Int64, T: IntTy, Type: reflect.TypeOf(int64(0)), Size: 64, stringKind: "int64"}}, TupleRawNames: []string{"aTypicalParamName"}}},
 	}
 
 	for _, tt := range tests {