InMemoryCaching: Difference between Set() and Add()

[ricsiLT]

Description

Why is there a difference between these two methods? What are the uses for them? From testing I see that one of them increments the _cacheSize and the other one doesn't. Why is that?

Related code

        var maxSize = 50_000;
        var cacheOptions = new InMemoryCachingOptions
        {
            SizeLimit = maxSize,
            ExpirationScanFrequency = 1
        };
        var cache = new InMemoryCaching("default", cacheOptions);
        foreach (var i in Enumerable.Range(1, maxSize))
        {
            cache.Add(i.ToString(), i);
        }

        foreach (var i in Enumerable.Range(maxSize, 10))
        {
            cache.Set(i.ToString(), i);
        }

        cache.Set("50011", 11);
        await Task.Delay(6000); // Just in case expiration cleanup is in progress??

        Assert.NotNull(cache.Get("50011"));
        Assert.Null(cache.Get("1")); // I'd expect this key to be missing, but it's not??

Expected behavior: [What you expected to happen]

Regardless of .Add() or .Set(), SizeLimit should be honored.

Actual behavior: [What actually happened]

When using .Set(), size limit is honored.
When using .Add(), size limit is ignored.

Specifications

    <PackageReference Include="EasyCaching.InMemory" Version="1.9.2" />