Incrementing or Decrementing a value and then calling `get` returns _Map<String, dynamic>

[Nidal-Bakir]

New Issue Checklist

• I am not disclosing a vulnerability.
• I am not just asking a question.
• I have searched through existing issues.
• I can reproduce the issue with the latest version of Parse Server and the Parse Flutter SDK.

Issue Description

Incrementing or Decrementing a value using setDecrement(key,amount) or setIncrement(key,amount) and then calling get(key) returns _Map<String, dynamic>

related to: #834, #696

Steps to reproduce

1. create ParseObject
2. increment or decrement a value using setIncrement or setDecrement functions
3. get the value using the value key with get("key")
4. the result of calling get("key") is Map which is not expected

code snippet:

final dietPlansObject = ParseObject("Diet_Plans");

final anyAmount = 1;
dietPlansObject.setIncrement("key", anyAmount);
// dietPlansObject.setDecrement("key", anyAmount);

final value = dietPlansObject.get("key");

print(value.runtimeType); // _Map<String, dynamic>

Actual Outcome

_Map<String, dynamic>

Expected Outcome

num

Environment

Parse Flutter SDK

• SDK version: 3.1.15
• Operating system version: any

Server

• Parse Server version: any

Logs

From tests error:

Expected: <Instance of 'num'>
Actual: {'__op': 'Increment', 'amount': 1.0}
Which: is not an instance of 'num'
package:test_api expect
test/src/objects/parse_object_test.dart 1180:11 main...

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[mtrezza]

@Nidal-Bakir I'm removing you from all issues as assignee. We do not use the assignment feature.

[Nidal-Bakir]

Fix via #860