Simplify updating object

[mtrezza]

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New Feature / Enhancement Checklist

• [x] I am not disclosing a vulnerability.
• [x] I am not just asking a question.
• [x] I have searched through existing issues.

Current Limitation

While https://github.com/parse-community/Parse-Swift/issues/401 with its PR https://github.com/parse-community/Parse-Swift/pull/406 was a great simplification when updating an object, it still requires special consideration when updating an object.

Specifically:

• A developer still has to keep in mind that there is a special approach with obj.key.set(\.key, to: "value2") (see example) needed to only send updated keys to the server, and they cannot simply use obj.key = "value2".
• The special method obj.key.set(\.key, to: "value2") contains a duplication of parameters; it requires a reference to key two times.

Feature / Enhancement Description

Further simplify to allow to use obj.key = "value2" without calling any special method.

Example Use Case

Example

Alternatives / Workarounds

Status quo

References

• Discussion about possible approach: https://github.com/parse-community/Parse-Swift/pull/263

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