No way to "unset" parameters when cloning

[mzattera]

I have created a Params object which stores some desired "default" configuration settings; I want to use it as "template" when creating new API requests, which I can then configure for specific calls. This in principle work except for some parameters, e.g.:

CompletionCreateParams template = CompletionCreateParams.builder().prompt("").maxTokens(500).echo(false).n(1).build()

// Now I want to create a copy of template, to use in a specific setting, changing only some of its parameters.
		
// This works
CompletionCreateParams copy = template.toBuilder().maxTokens(250).build();

// But this doesn't so I cannot say "use default value for max tokens"
copy = template.toBuilder().maxTokens(null).build();

I think for optional parameters builder should always take nullable values (Integer in this case), otherwise is impossible to "unset" a parameter once it has been set. This will be consistent with same parameters returning Optional<> when they are read.

Is there a workaround already I do not see?