More exploration of readonly instance members
More exploration of readonly instance members

Interestingly:

- Automatically-implemented properties on structs in C# 8 can be more efficient than the "obvious" pre-C# 8 manual code (when accessed via a readonly field of the struct type)
- The `readonly` modifier can be applied to separate accessors in a property
- It's feasible (but weird) to have a read-only setter but a non-read-only getter

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