Why set method is not present in IKeyVaultSecretManager of Microsoft.Extensions.Configuration.AzureKeyVault

Hi,

I am using Microsoft.Extensions.Configuration for accessing Key/Value. But I am unable to update the value of a particular key.  

For KeyVault configuration we can implement our own IKeyVaultSecretManager but it doesn't contain any set method. Why there is no set method in the library?

Thanks

Akash