`Parse.Query.readPreference` condition is missing in output of `Parse.Query.toJSON`

[mtrezza]

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Issue Description

The Parse.Query.readPreference condition is missing in the output of Parse.Query.toJSON().

Steps to reproduce

const q = new Parse.Query('Test');
q.readPreference('NEAREST');
const json = q.toJSON();

Actual Outcome

The returned JSON does not contain the read preference, but it does contain other conditions like Parse.Query.limit, etc.

Expected Outcome

• Parse.Query.toJSON() should contain the read preference condition.
• Parse.Query.fromJSON() should correctly parse the read preference condition.

Environment

Server

• Parse JS SDK version: 6.0.0-alpha.2

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[dplewis]

This is a JS SDK issue similar to #918

[mtrezza]

Oh right, moving it...

[mtrezza]

False alarm, but I'm adding the missing test for this in #2465.

[parseplatformorg]

🎉 This change has been released in version 6.0.0