  Recent numerical explorations of extremely intense circulation fluctuations
at high Reynolds number flows have brought to light novel aspects of turbulent
intermittency. Vortex gas modeling ideas, introduced alongside such
developments, have led to accurate descriptions of the core and the
intermediate tails of circulation probability distribution functions (cPDFs),
as well as the scaling exponents associated to statistical moments of
circulation. We extend the predictive reach of the vortex gas picture of
turbulence, by emphasizing that multifractality breaking, one of its salient
phenomenological ingredients, is the key concept to disclose the asymptotic
form of cPDF tails. A remarkable analytical agreement is found with previous
results derived within the framework of the instanton approach to circulation
intermittency.
