Wall-model validation accepts every les spelling the launcher enables (3804ea21): les: true, a model name, an integer code, or a block without enabled no longer fail as "no turbulence model". One mapping, resolve_les_model_code(), serves the launcher, this check and the statistics availability check (e6501898), which had refused Nu_t/CS statistics for such spellings and raised on les: true.
u_hydset_roughness() continues the log branch above y+ = 300, as its inverse does, instead of returning -1 (60f2565c); the forward wall laws are documented as the definitions their inverses are tested against.