[DataGrid] Fix memory leaks in development

[cherniavskii]

Fixes #6566 (comment)

[mui-bot]

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These are the results for the performance tests:

Test case	Unit	Min	Max	Median	Mean	σ
Filter 100k rows	ms	642.7	1,217.7	647.7	820.98	220.72
Sort 100k rows	ms	648.2	1,267.7	648.2	976.78	220.087
Select 100k rows	ms	232.9	476.6	236.8	307.7	96.86
Deselect 100k rows	ms	154.4	313.9	192.5	214.38	60.445

Generated by 🚫 dangerJS against 3a0cba1

[zroug]

Great to see this so quickly!

Not a strong opinion, but it might make sense to use an opaque new Object() (without a numeric id property) as the instance id. I'm not familiar with the codebase, but if the numeric id isn't needed elsewhere, that avoids confusion about whether structural or identity equality is being used.

[cherniavskii]

Not a strong opinion, but it might make sense to use an opaque new Object() (without a numeric id property) as the instance id.

You're right, the only reason to keep the id is for testing/debugging to make it easier to distinguish different API objects.