fix: array schema definitions with of keyword

lib/schema.js

@@ -1268,6 +1268,7 @@ Schema.prototype.interpretAsType = function(path, obj, options) {
     return clone;
   }
 
+
   // If this schema has an associated Mongoose object, use the Mongoose object's
   // copy of SchemaTypes re: gh-7158 gh-6933
   const MongooseTypes = this.base != null ? this.base.Schema.Types : Schema.Types;
@@ -1333,9 +1334,13 @@ Schema.prototype.interpretAsType = function(path, obj, options) {
       }
       return new MongooseTypes.DocumentArray(path, cast[options.typeKey], obj, cast);
     }
-
-    if (Array.isArray(cast)) {
-      return new MongooseTypes.Array(path, this.interpretAsType(path, cast, options), obj);
+    if (typeof cast !== 'undefined') {
+      if (Array.isArray(cast) || cast.type === Array || cast.type == 'Array') {
+        if (cast && cast.type == 'Array') {
+          cast.type = Array;
+        }
+        return new MongooseTypes.Array(path, this.interpretAsType(path, cast, options), obj);
+      }
     }
 
     // Handle both `new Schema({ arr: [{ subpath: String }] })` and `new Schema({ arr: [{ type: { subpath: string } }] })`
@@ -1386,7 +1391,6 @@ Schema.prototype.interpretAsType = function(path, obj, options) {
       type = cast[options.typeKey] && (options.typeKey !== 'type' || !cast.type.type)
         ? cast[options.typeKey]
         : cast;
-
       if (Array.isArray(type)) {
         return new MongooseTypes.Array(path, this.interpretAsType(path, type, options), obj);
       }

test/schema.test.js

@@ -3202,4 +3202,14 @@ describe('schema', function() {
     const doc = new baseModel({ type: 1, self: [{ type: 1 }] });
     assert.equal(doc.self[0].type, 1);
   });
+  it('should have the correct schema definition with array schemas (gh-14416)', function() {
+    const schema = new Schema({
+      nums: [{ type: Array, of: Number }],
+      tags: [{ type: 'Array', of: String }],
+      subdocs: [{ type: Array, of: Schema({ name: String }) }]
+    });
+    assert.equal(schema.path('nums.$').caster.instance, 'Number'); // actually Mixed
+    assert.equal(schema.path('tags.$').caster.instance, 'String'); // actually Mixed
+    assert.equal(schema.path('subdocs.$').casterConstructor.schema.path('name').instance, 'String'); // actually Mixed
+  });
 });