Update sanctuary-type-identifiers to version 3

package.json

@@ -61,7 +61,7 @@
  ],
  "dependencies": {
  "sanctuary-show": "^2.0.0",
- "sanctuary-type-identifiers": "^2.0.0"
+ "sanctuary-type-identifiers": "^3.0.0"
  },
  "devDependencies": {
  "c8": "^7.0.0",

src/future.js

@@ -59,7 +59,13 @@ export function isFuture(x){
  return x instanceof Future || type(x) === $$type;
 }
 
+// Compliance with sanctuary-type-identifiers versions 1 and 2.
+// To prevent sanctuary-type-identifiers version 3 from identifying 'Future'
+// as being of the type denoted by $$type, we ensure that
+// Future.constructor.prototype is equal to Future.
 Future['@@type'] = $$type;
+Future.constructor = {prototype: Future};
+
 Future[FL.of] = resolve;
 Future[FL.chainRec] = chainRec;
 

src/par.js

@@ -23,7 +23,12 @@ export function Par (sequential){
 var $$type = namespace + '/ConcurrentFuture@' + version;
 var zeroInstance = new ConcurrentFuture(never);
 
+// Compliance with sanctuary-type-identifiers versions 1 and 2.
+// To prevent sanctuary-type-identifiers version 3 from identifying
+// 'Par' as being of the type denoted by $$type, we ensure that
+// Par.constructor.prototype is equal to Par.
 Par['@@type'] = $$type;
+Par.constructor = {prototype: Par};
 
 Par[FL.of] = function Par$of(x){
  return new ConcurrentFuture(resolve(x));

test/arbitraries.js

@@ -61,6 +61,8 @@ export const {
  jsv.bool,
  jsv.falsy,
  jsv.constant(new Error('Kapot')),
+ jsv.constant(Future),
+ jsv.constant(Par),
  tie('anyFunction')
  ),
  any: jsv.oneof(

test/unit/0.error.js

@@ -52,7 +52,7 @@ test('invalidArity constructs a TypeError', function (){
 });
 
 var mockType = function (identifier){
- return {'constructor': {'@@type': identifier}, '@@show': function (){
+ return {'@@type': identifier, '@@show': function (){
  return 'mockType("' + identifier + '")';
  }};
 };