Why is there is a separate macro for parameterized classes factory registration?

UVM
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Why is there is a separate macro for parameterized classes factory registration? For example: uvm_component_param_utils

What happens under the hood compared the non-paramterized classed macro?

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In reply to Verif Engg:

See uvm_component_utils vs `uvm_component_param_utils in factory. | Verification Academy