Optimization: Don't pass not-readonly PackedFieldDescriptor with in specifier
#197
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See explanation at https://devblogs.microsoft.com/premier-developer/the-in-modifier-and-the-readonly-structs-in-c/
you should never pass a non-readonly struct as in parameter
|| Method | Mean | Error | StdDev |
|----------------------- |----------:|----------:|----------:|
|AggregatePassedByValue | 71.24 us | 0.3150 us | 0.2278 us |
| AggregatePassedByIn | 124.02 us | 3.2885 us | 9.6963 us |
And making this struct
readonlyrequires more code rewriting