How to Get/Set A Type Not byte[]

### Is your feature request related to a problem? Please describe.
I Need Get/Set A Type Not byte[]

### Describe the solution you'd like
```csharp
private readonly IDistributedCache _genricCache;
private readonly IDistributedCache _cache;
public async Task Test()
{
Person person = await _genricCache.GetAsync(key);
//Or
Person person = await _cache.GetAsync(key);
}
```

@Rick-Anderson edit: Integrated issue

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#### Document Details

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* ID: 0d01025d-86b2-bb2d-86c1-ef0695bc98e3
* Version Independent ID: 5b9a6572-3671-0d54-b2ef-83d04f8b3e96
* Content: [Distributed caching in ASP.NET Core](https://docs.microsoft.com/en-us/aspnet/core/performance/caching/distributed?view=aspnetcore-3.0)
* Content Source: [aspnetcore/performance/caching/distributed.md](https://github.com/aspnet/AspNetCore.Docs/blob/master/aspnetcore/performance/caching/distributed.md)
* Product: **aspnet-core**
* Technology: **aspnetcore-performance**
* GitHub Login: @guardrex
* Microsoft Alias: **riande**