Tell Me Lies, Tell Me Lies, Tell Me Sweet Little Lies
summary
Code contains concrete lies: a compile-time query says a type is constructible via static_assert and detection idioms but construction fails at use, so SFINAE-style detection is added and a custom is_invocable trait replaces the false positives. An rvalue-qualified call operator plus by-value parameters makes temporaries degrade unexpectedly until fixed with perfect forwarding, so callables are passed as forwarding references and std::forward to preserve qualifiers and semantics; after these fixes the examples compile and behave as asserted.
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