InNamespace() is error prone due to use of StartsWith()

[mattwcole]

Types.InNamespace(searchTerm) will incorrectly match all namespaces that start with searchTerm. For example:

namespace Orders
{
    public class Order;
}

namespace OrderSamples
{
    public class Sample;
}

public class Tests
{
    [Fact]
    public void Test()
    {
        var result = Types.InNamespace("Orders").GetTypes();
        Assert.Single(result);  // Fails as OrderSamples.Sample also matched
    }
}