Addressing the limitation of the LOOPHOLE

There is currently a limitation in the code for LOOPHOLE:

> None of the member fields should have a template constructor with one parameter.

This limitation could be solved using the following strategy: [link](https://godbolt.org/z/nrjx19Mce)

Start with the LOOPHOLE limitation described in the issue and run the linked Godbolt example to understand the proposed strategy. Trace the relevant LOOPHOLE implementation and determine how the one-parameter template-constructor restriction is enforced. Done means the limitation is addressed and the example works as intended.

Written by the indexing model from the issue text.